Cypress CY7C602xx WriteBlock Function, 5. WriteBlock Parameters, EraseBlock Function, Mode, Name

Page 17
11.5.3 WriteBlock Function

CY7C601xx, CY7C602xx

11.5.3 WriteBlock Function

The WriteBlock function is used to store data in Flash. Data is moved 64 bytes at a time from SRAM to Flash using this function. The WriteBlock function first checks the protection bits and deter- mines if the desired BLOCKID is writable. If write protection is turned on, the WriteBlock function exits setting the accumulator and KEY2 back to 00h. KEY1 has a value of 01h, indicating a write failure. The configuration of the WriteBlock function is straightforward. The BLOCKID of the Flash block, where the data is stored, is determined and stored at SRAM address FAh.

The SRAM address of the first of the 64 bytes to be stored in Flash is indicated using the POINTER variable in the parameter block (SRAM address FBh). Finally, the CLOCK and DELAY value are set correctly. The CLOCK value determines the length of the write pulse used to store the data in Flash. The CLOCK and DELAY values are dependent on the CPU speed and must be set correctly. Refer to the Clocking section for additional infor- mation.

Table 11-5. WriteBlock Parameters

Name

Address

Description

KEY1

0,F8h

3Ah

 

 

 

KEY2

0,F9h

Stack Pointer value, when SSC is

 

 

executing

BLOCK ID

0,FAh

8 KB Flash block number (00h–7Fh)

 

 

4 KB Flash block number (00h–3Fh)

 

 

3 KB Flash block number (00h–2Fh)

POINTER

0,FBh

First 64 addresses in SRAM where

 

 

the data is stored in Flash is located

 

 

before calling WriteBlock

CLOCK

0,FCh

Clock Divider used to set the write

 

 

pulse width

DELAY

0,FEh

For a CPU speed of 12 MHz set to 56h

 

 

 

11.5.4 EraseBlock Function

The EraseBlock function is used to erase a block of 64 contiguous bytes in Flash. The EraseBlock function first checks the protection bits and determines if the desired BLOCKID is writable. If write protection is turned on, the EraseBlock function exits setting the accumulator and KEY2 back to 00h. KEY1 has a value of 01h, indicating a write failure. The EraseBlock function is only useful as the first step in programming. Erasing a block does not make data in a block fully unreadable. If the objective is to obliterate data in a block, the best method is to perform an EraseBlock followed by a WriteBlock of all zeros.

To set up the parameter block for EraseBlock, correct key values must be stored in KEY1 and KEY2. The block number to be erased is stored in the BLOCKID variable and the CLOCK and DELAY values are set based on the current CPU speed.

Table 11-6. EraseBlock Parameters

Name

Address

Description

KEY1

0,F8h

3Ah

 

 

 

KEY2

0,F9h

Stack Pointer value, when SSC is

 

 

executed

BLOCKID

0,FAh

Flash block number (00h–7Fh)

 

 

 

CLOCK

0,FCh

Clock Divider used to set the erase

 

 

pulse width

DELAY

0,FEh

For a CPU speed of 12 MHz set to

 

 

56h

11.5.5 ProtectBlock Function

The enCoRe II LV devices offer Flash protection on a block-by-block basis. Table 11-7lists the protection modes available. In the table, ER and EW indicate the ability to perform external reads and writes; IW is used for internal writes. Internal reading is always permitted using the ROMX instruction. The ability to read using the SROM ReadBlock function is indicated by SR. The protection level is stored in two bits according to Table 11-7. These bits are bit packed into 64 bytes of the protection block. Therefore, each protection block byte stores the protection level for four Flash blocks. The bits are packed into a byte, with the lowest numbered block’s protection level stored in the lowest numbered bits in Table 11-7.

The first address of the protection block contains the protection level for blocks 0 through 3; the second address is for blocks 4 through 7. The 64th byte stores the protection level for blocks 252 through 255.

Table 11-7. Protection Modes

Mode

 

Settings

Description

Marketing

00b

 

SR ER EW IW

Unprotected

Unprotected

 

 

 

 

 

 

 

 

 

 

01b

 

SR

 

 

ER

 

EW IW

Read protect

Factory upgrade

10b

 

SR

 

ER

 

EW

 

IW

Disable external

Field upgrade

 

 

 

 

 

 

 

 

 

 

 

write

 

11b

 

SR

 

ER

 

EW

 

IW

 

Disable internal

Full protection

 

 

 

 

 

 

 

 

 

 

 

write

 

7

6

5

4

3

2

1

0

Block

n+3

Block

n+2

Block

n+1

Block n

 

 

 

 

 

 

 

 

Only an EraseAll decreases the protection level by placing zeros in all locations of the protection block. To set the level of protection, the ProtectBlock function is used. This function takes data from SRAM, starting at address 80h, and ORs it with the current values in the protection block. The result of the OR operation is then stored in the protection block. The EraseBlock function does not change the protection level for a block. Because the SRAM location for the protection data is fixed and there is only one protection block per Flash macro, the Protect- Block function expects very few variables in the parameter block to be set before calling the function. The parameter block values that are, besides the keys, are the CLOCK and DELAY values.

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Contents 2. Logic Block Diagram 1. FeaturesCY7C601xx, CY7C602xx Cypress Semiconductor Corporation5. Conventions 3. Applications4. Introduction 6. Pinouts Figure 6-1. Package Configurations Top ViewCY7C60223 24-Pin PDIP6.1 Pin Assignments CY7C601xx, CY7C602xxTable 6-1. Pin Assignments NameTable 6-1. Pin Assignments continued 7. Register Summary DefaultTable 7-1. enCoRe II LV Register Summary AddrTable 7-1. enCoRe II LV Register Summary continued 9. CPU Registers 8. CPU Architecture9.1 Flags Register Table 8-1. CPU Registers and Register NameTable 9-2. CPU Accumulator Register CPUA 9.1.1 Accumulator Register9.1.2 Index Register Table 9-3. CPU X Register CPUX9.2.1 Source Immediate 9.2 Addressing ModesTable 9-7. Source Immediate OpcodeTable 9-11. Destination Indexed 9.2.5 Destination IndexedExample 9.2.6 Destination Direct Source Immediate9.2.9 Source Indirect Post Increment 10. Instruction Set SummaryTable 9-15. Source Indirect Post Increment 9.2.10 Destination Indirect Post IncrementCycles 11.1 Flash Program Memory Organization 11. Memory OrganizationFigure 11-1. Program Memory Space with Interrupt Vector Table 0x1FFF11.3 Flash 11.2 Data Memory Organization11.4 SROM Figure 11-2. Data Memory Organization11.5 SROM Function Descriptions 11.5.1 SWBootReset FunctionTable 11-2. SROM Function Parameters Variable Name11.5.3 WriteBlock Function SettingsTable 11-5. WriteBlock Parameters 11.5.4 EraseBlock Function11.5.6 EraseAll Function Table 11-8. ProtectBlock Parameters11.5.7 TableRead Function Table 11-10. Table Read ParametersPage 19 of 11.6 SROM Table Read Descriptioneg ti 12. Clocking Table 12-1. Oscillator Trim Values vs. Voltage Settings12.1 Trim Values for the IOSCTR Register Gain value for the register at location 0x38 3.3V =12.2.1 CPU Clock 12.2 Clock Architecture DescriptionTable 12-2. CPU Clock Configuration CPUCLKCR 0x30 R/W Figure 12-1. CPU Clock Block DiagramBit 71 Reserved Table 12-3. OSC Control 0 OSCCR0 0x1E0 R/WSleep Timer Clock Sleep TimerCPU when Internal Table 12-3. OSC Control 0 OSCCR0 0x1E0 R/W continuedBit 75 Reserved Table 12-4. Clock IO Configuration CLKIOCR 0x32 R/W12.2.2 Interval Timer Clock ITMRCLK Figure 12-3. Timer Capture Block Diagram Figure 12-2. Programmable Interval Timer Block Diagram12.2.3 Timer Capture Clock TCAPCLK Page 27 of Table 12-5. Timer Clock Configuration TMRCLKCR 0x31 R/W12.2.4 Internal Clock Trim XGM SettingTable 12-6. IOSC Trim IOSCTR 0x34 R/W Bit 40 GainTable 12-8. LPOSC Trim LPOSCTR 0x36 R/W 12.3 CPU Clock During Sleep Mode12.2.6 LPOSC Trim Table 13-1. System Status and Control Register CPUSCR 0xFF R/W 13. ResetBit 7 GIES Bit 5 WDRS13.2 Watchdog Timer Reset 13.1 Power On ResetTable 13-2. Reset Watchdog Timer RESWDT 0xE3 W 14. Sleep Mode14.1 Sleep Sequence 14.1.1 Low Power in Sleep ModeCPUCLK IOW SLEEP BRQ BRA PD Figure 14-1. Sleep TimingFigure 14-2. Wakeup Timing 14.2 Wakeup SequenceTable 15-1. Low Voltage Control Register LVDCR 0x1E3 R/W 15. Low Voltage Detect ControlBit 76 Reserved Bit 54 PORLEV10 Bit 20 VM2015.2 ECO Trim Register 15.1 POR Compare StateTable 15-2. Voltage Monitor Comparators Register VLTCMP 0x1E4 R Bit 72 Reserved Bit 1 LVD16.1 Port Data Registers 16. General Purpose IO Ports16.1.1 P0 Data Table 16-1. P0 Data Register P0DATA0x00 R/W16.2.1 Int Enable 16.2 GPIO Port Configuration16.1.3 P2 Data Table 16-3. P2 Data Register P2DATA 0x02 R/W16.2.6 Pull Up Enable 16.2.7 Output EnableFigure 16-1. GPIO Block Diagram 16.2.9 P0.0/CLKIN Configuration16.2.11 P0.2/INT0-P0.4/INT2 Configuration 16.2.10 P0.1/CLKOUT ConfigurationTable 16-7. P0.1/CLKOUT Configuration P01CR 0x06 R/W 16.2.13 P0.7 Configuration 16.2.12 P0.5/TIO0-P0.6/TIO1 ConfigurationTable 16-10. P0.7 Configuration P07CR 0x0C R/W 16.2.14 P1.0 ConfigurationTable 16-12. P1.1 Configuration P11CR 0x0E R/W 16.2.15 P1.1 Configuration16.2.16 P1.2 Configuration Table 16-13. P1.2 Configuration P12CR 0x0F R/WTable 16-15. P1.4-P1.6 Configuration P14CR-P16CR 0x11-0x13 R/W 16.2.18 P1.4-P1.6 Configuration SCLK, SMOSI, SMISO16.2.19 P1.7 Configuration Table 16-16. P1.7 Configuration P17CR 0x14 R/WTable 16-18. P3 Configuration P3CR 0x16 R/W 16.2.21 P3 Configuration16.2.22 P4 Configuration Table 16-19. P4 Configuration P4CR 0x17 R/W17. Serial Peripheral Interface SPI Figure 17-1. SPI Block DiagramTable 17-2. SPI Configure Register SPICR 0x3D R/W 17.2 SPI Configure Register17.1 SPI Data Register Table 17-1. SPI Data Register SPIDATA 0x3C R/WDiagram Table 17-3. SPI Mode Timing vs. LSB First, CPOL, and CPHACPHA CPOL17.3 SPI Interface Pins 18. Timer RegistersFigure 18-1. 16-Bit Free Running Counter Block Diagram Table 18-1. Free Running Timer Low Order Byte FRTMRL 0x20 R/WFigure 18-2. Time Capture Block Diagram Table 18-2. Free Running Timer High Order Byte FRTMRH 0x21 R/WTable 18-3. Timer Configuration TMRCR 0x2A R/W 18.1.2 Time CaptureTable 18-5. Timer Capture 0 Rising TCAP0R 0x22 R/W Table 18-4. Capture Interrupt Enable TCAPINTE 0x2B R/WTable 18-6. Timer Capture 1 Rising TCAP1R 0x23 R/W Table 18-7. Timer Capture 0 Falling TCAP0F 0x24 R/W18.1.3 Programmable Interval Timer Table 18-8. Timer Capture 1 Falling TCAP1F 0x25 R/WTable 18-10. Programmable Interval Timer Low PITMRL 0x26 R Table 18-9. Capture Interrupt Status TCAPINTS 0x2C R/WTable 18-13. Programmable Interval Reload High PIRH 0x29 R/W Table 18-11. Programmable Interval Timer High PITMRH 0x27 RTable 18-12. Programmable Interval Reload Low PIRL 0x28 R/W Page 52 of Figure 18-3. Timer Functional Sequence DiagramFigure 18-5. Memory Mapped Registers Read and Write Timing Diagram Figure 18-4. 16-Bit Free Running Counter Loading Timing Diagram19. Interrupt Controller Figure 19-1. Interrupt Controller Block Diagram19.1 Architectural Description Table 19-1. Interrupt Priorities, Address, and Name19.3 Interrupt Latency 19.2 Interrupt Processing19.4 Interrupt Registers Table 19-2. Interrupt Clear 0 INTCLR0 0xDA R/WInterrupt Clear 2 INTCLR2 0xDC R/W Table 19-3. Interrupt Clear 1 INTCLR1 0xDB R/W19.4.2 Interrupt Mask Registers Table 19-5. Interrupt Mask 3 INTMSK3 0xDE R/WPage 57 of Table 19-6. Interrupt Mask 2 INTMSK2 0xDF R/WTable 19-7. Interrupt Mask 1 INTMSK1 0xE1 R/W Table 19-9. Interrupt Vector Clear Register INTVC 0xE2 R/W Table 19-8. Interrupt Mask 0 INTMSK0 0xE0 R/W19.4.3 Interrupt Vector Clear Register 20. Absolute Maximum Ratings 20.1 DC CharacteristicsParameter ConditionsClock 20.2 AC CharacteristicsSPI Timing Figure 20-1. Clock TimingSCK CPOL=0 Figure 20-2. GPIO Timing DiagramSCK CPOL=1 MOSI MISOMISO MOSISS SCK CPOL=0 SCK CPOL=1 MOSI MISO MSB22. Package Handling 21. Ordering InformationSCK CPOL=0 SCK CPOL=1 MOSI MSBFigure 23-1. 24-Pin 300-Mil SOIC S13 23. Package DiagramsFigure 23-2. 24-Pin 300-Mil PDIP P13 3. DIMENSIONS IN INCHESPage 65 of Figure 23-3. 24-Pin QSOP O241Figure 23-4. 28-Pin 5.3 mm Shrunk Small Outline Package O28 Page 66 of Figure 23-5. 40-Pin 600-Mil Molded DIP P17Figure 23-6. 48-Pin Shrunk Small Outline Package O48 Document Number 24. Document History PageOrig. of SubmissionPSoC Solutions Sales, Solutions, and Legal InformationWorldwide Sales and Design Support Products
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