Cypress manual Clock Architecture Description, CPU Clock, CY7C601xx, CY7C602xx

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12.2 Clock Architecture Description

CY7C601xx, CY7C602xx

When using the 32 kHz oscillator, the PITMRL/H is read until two consecutive readings match before sending and receiving data. The following firmware example assumes the developer is interested in the lower byte of the PIT.

Read_PIT_counter: mov A, reg[PITMRL] mov [57h], A

mov A, reg[PITMRL] mov [58h],A

mov [59h], A

mov A, reg[PITMRL] mov [60h], A

;;;Start comparison mov A,[60h]

mov X, [59h] sub A, [59h] jz done mov A, [59h] mov X, [58h] sub A, [58h] jz done mov X, [57h]

;;;correct data is in memory location 57h done:

mov [57h], X ret

The CY7C601xx part is optionally sourced from an external crystal oscillator. The external clock driving on CLKIN range is from 187 KHz to 24 MHz.

12.2 Clock Architecture Description

The enCoRe II LV clock selection circuitry allows the selection of independent clocks for the CPU, Interval Timers, and Capture Timers.

On the CY7C601xx, the external oscillator is sourced by the crystal oscillator. When the crystal oscillator is disabled, it is sourced directly from the CLKIN pin. The external crystal oscillator is fed through the EFTB block, which is optionally bypassed.

12.2.1 CPU Clock

The CPU clock, CPUCLK, is sourced from the external crystal oscillator, the internal 24 MHz oscillator, or the Internal 32 kHz low power oscillator. The selected clock source can optionally be divided by 2n-1where n is 0–7 (see Table 12-3).

When it is not being used by the external crystal oscillator, the CLKOUT pin is driven from one of many sources. This is used for test and also in some applications. The sources that drive the CLKOUT are:

■CLKIN after the optional EFTB filter.

■Internal 24 MHz Oscillator.

■Internal 32 kHz Oscillator.

■CPUCLK after the programmable divider.

Document 38-16016 Rev. *E

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Contents CY7C601xx, CY7C602xx 1. Features2. Logic Block Diagram Cypress Semiconductor Corporation4. Introduction 3. Applications5. Conventions CY7C60223 Figure 6-1. Package Configurations Top View6. Pinouts 24-Pin PDIPTable 6-1. Pin Assignments CY7C601xx, CY7C602xx6.1 Pin Assignments NameTable 6-1. Pin Assignments continued Table 7-1. enCoRe II LV Register Summary Default7. Register Summary AddrTable 7-1. enCoRe II LV Register Summary continued 9.1 Flags Register 8. CPU Architecture9. CPU Registers Table 8-1. CPU Registers and Register Name9.1.2 Index Register 9.1.1 Accumulator RegisterTable 9-2. CPU Accumulator Register CPUA Table 9-3. CPU X Register CPUXTable 9-7. Source Immediate 9.2 Addressing Modes9.2.1 Source Immediate OpcodeExample 9.2.5 Destination IndexedTable 9-11. Destination Indexed 9.2.6 Destination Direct Source ImmediateTable 9-15. Source Indirect Post Increment 10. Instruction Set Summary9.2.9 Source Indirect Post Increment 9.2.10 Destination Indirect Post IncrementBytes Figure 11-1. Program Memory Space with Interrupt Vector Table 11. Memory Organization11.1 Flash Program Memory Organization 0x1FFF11.4 SROM 11.2 Data Memory Organization11.3 Flash Figure 11-2. Data Memory OrganizationTable 11-2. SROM Function Parameters 11.5.1 SWBootReset Function11.5 SROM Function Descriptions Variable NameTable 11-5. WriteBlock Parameters Settings11.5.3 WriteBlock Function 11.5.4 EraseBlock Function11.5.7 TableRead Function Table 11-8. ProtectBlock Parameters11.5.6 EraseAll Function Table 11-10. Table Read Parameters11.6 SROM Table Read Description Page 19 ofeg ti 12.1 Trim Values for the IOSCTR Register Table 12-1. Oscillator Trim Values vs. Voltage Settings12. Clocking Gain value for the register at location 0x38 3.3V =12.2 Clock Architecture Description 12.2.1 CPU ClockBit 71 Reserved Figure 12-1. CPU Clock Block DiagramTable 12-2. CPU Clock Configuration CPUCLKCR 0x30 R/W Table 12-3. OSC Control 0 OSCCR0 0x1E0 R/WCPU when Internal Sleep TimerSleep Timer Clock Table 12-3. OSC Control 0 OSCCR0 0x1E0 R/W continued12.2.2 Interval Timer Clock ITMRCLK Table 12-4. Clock IO Configuration CLKIOCR 0x32 R/WBit 75 Reserved 12.2.3 Timer Capture Clock TCAPCLK Figure 12-2. Programmable Interval Timer Block DiagramFigure 12-3. Timer Capture Block Diagram Table 12-5. Timer Clock Configuration TMRCLKCR 0x31 R/W Page 27 ofTable 12-6. IOSC Trim IOSCTR 0x34 R/W XGM Setting12.2.4 Internal Clock Trim Bit 40 Gain12.2.6 LPOSC Trim 12.3 CPU Clock During Sleep ModeTable 12-8. LPOSC Trim LPOSCTR 0x36 R/W Bit 7 GIES 13. ResetTable 13-1. System Status and Control Register CPUSCR 0xFF R/W Bit 5 WDRSTable 13-2. Reset Watchdog Timer RESWDT 0xE3 W 13.1 Power On Reset13.2 Watchdog Timer Reset 14. Sleep ModeCPUCLK IOW SLEEP BRQ BRA PD 14.1.1 Low Power in Sleep Mode14.1 Sleep Sequence Figure 14-1. Sleep Timing14.2 Wakeup Sequence Figure 14-2. Wakeup TimingBit 76 Reserved Bit 54 PORLEV10 15. Low Voltage Detect ControlTable 15-1. Low Voltage Control Register LVDCR 0x1E3 R/W Bit 20 VM20Table 15-2. Voltage Monitor Comparators Register VLTCMP 0x1E4 R 15.1 POR Compare State15.2 ECO Trim Register Bit 72 Reserved Bit 1 LVD16.1.1 P0 Data 16. General Purpose IO Ports16.1 Port Data Registers Table 16-1. P0 Data Register P0DATA0x00 R/W16.1.3 P2 Data 16.2 GPIO Port Configuration16.2.1 Int Enable Table 16-3. P2 Data Register P2DATA 0x02 R/WFigure 16-1. GPIO Block Diagram 16.2.7 Output Enable16.2.6 Pull Up Enable 16.2.9 P0.0/CLKIN ConfigurationTable 16-7. P0.1/CLKOUT Configuration P01CR 0x06 R/W 16.2.10 P0.1/CLKOUT Configuration16.2.11 P0.2/INT0-P0.4/INT2 Configuration Table 16-10. P0.7 Configuration P07CR 0x0C R/W 16.2.12 P0.5/TIO0-P0.6/TIO1 Configuration16.2.13 P0.7 Configuration 16.2.14 P1.0 Configuration16.2.16 P1.2 Configuration 16.2.15 P1.1 ConfigurationTable 16-12. P1.1 Configuration P11CR 0x0E R/W Table 16-13. P1.2 Configuration P12CR 0x0F R/W16.2.19 P1.7 Configuration 16.2.18 P1.4-P1.6 Configuration SCLK, SMOSI, SMISOTable 16-15. P1.4-P1.6 Configuration P14CR-P16CR 0x11-0x13 R/W Table 16-16. P1.7 Configuration P17CR 0x14 R/W16.2.22 P4 Configuration 16.2.21 P3 ConfigurationTable 16-18. P3 Configuration P3CR 0x16 R/W Table 16-19. P4 Configuration P4CR 0x17 R/WFigure 17-1. SPI Block Diagram 17. Serial Peripheral Interface SPI17.1 SPI Data Register 17.2 SPI Configure RegisterTable 17-2. SPI Configure Register SPICR 0x3D R/W Table 17-1. SPI Data Register SPIDATA 0x3C R/WCPHA Table 17-3. SPI Mode Timing vs. LSB First, CPOL, and CPHADiagram CPOLFigure 18-1. 16-Bit Free Running Counter Block Diagram 18. Timer Registers17.3 SPI Interface Pins Table 18-1. Free Running Timer Low Order Byte FRTMRL 0x20 R/WTable 18-3. Timer Configuration TMRCR 0x2A R/W Table 18-2. Free Running Timer High Order Byte FRTMRH 0x21 R/WFigure 18-2. Time Capture Block Diagram 18.1.2 Time CaptureTable 18-6. Timer Capture 1 Rising TCAP1R 0x23 R/W Table 18-4. Capture Interrupt Enable TCAPINTE 0x2B R/WTable 18-5. Timer Capture 0 Rising TCAP0R 0x22 R/W Table 18-7. Timer Capture 0 Falling TCAP0F 0x24 R/WTable 18-10. Programmable Interval Timer Low PITMRL 0x26 R Table 18-8. Timer Capture 1 Falling TCAP1F 0x25 R/W18.1.3 Programmable Interval Timer Table 18-9. Capture Interrupt Status TCAPINTS 0x2C R/WTable 18-12. Programmable Interval Reload Low PIRL 0x28 R/W Table 18-11. Programmable Interval Timer High PITMRH 0x27 RTable 18-13. Programmable Interval Reload High PIRH 0x29 R/W Figure 18-3. Timer Functional Sequence Diagram Page 52 ofFigure 18-4. 16-Bit Free Running Counter Loading Timing Diagram Figure 18-5. Memory Mapped Registers Read and Write Timing Diagram19.1 Architectural Description Figure 19-1. Interrupt Controller Block Diagram19. Interrupt Controller Table 19-1. Interrupt Priorities, Address, and Name19.4 Interrupt Registers 19.2 Interrupt Processing19.3 Interrupt Latency Table 19-2. Interrupt Clear 0 INTCLR0 0xDA R/W19.4.2 Interrupt Mask Registers Table 19-3. Interrupt Clear 1 INTCLR1 0xDB R/WInterrupt Clear 2 INTCLR2 0xDC R/W Table 19-5. Interrupt Mask 3 INTMSK3 0xDE R/WTable 19-7. Interrupt Mask 1 INTMSK1 0xE1 R/W Table 19-6. Interrupt Mask 2 INTMSK2 0xDF R/WPage 57 of 19.4.3 Interrupt Vector Clear Register Table 19-8. Interrupt Mask 0 INTMSK0 0xE0 R/WTable 19-9. Interrupt Vector Clear Register INTVC 0xE2 R/W Parameter 20.1 DC Characteristics20. Absolute Maximum Ratings ConditionsSPI Timing 20.2 AC CharacteristicsClock Figure 20-1. Clock TimingSCK CPOL=1 Figure 20-2. GPIO Timing DiagramSCK CPOL=0 MOSI MISOSS SCK CPOL=0 SCK CPOL=1 MOSIMISO MOSI MISO MSBSCK CPOL=0 SCK CPOL=1 21. Ordering Information22. Package Handling MOSI MSBFigure 23-2. 24-Pin 300-Mil PDIP P13 23. Package DiagramsFigure 23-1. 24-Pin 300-Mil SOIC S13 3. DIMENSIONS IN INCHESFigure 23-4. 28-Pin 5.3 mm Shrunk Small Outline Package O28 Figure 23-3. 24-Pin QSOP O241Page 65 of Figure 23-6. 48-Pin Shrunk Small Outline Package O48 Figure 23-5. 40-Pin 600-Mil Molded DIP P17Page 66 of Orig. of 24. Document History PageDocument Number SubmissionWorldwide Sales and Design Support Sales, Solutions, and Legal InformationPSoC Solutions Products