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IBM EM78P312N manual Interrupt, Bit Microcontroller

Models: EM78P312N

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5.15 Interrupt

EM78P312N

8-Bit Microcontroller

	VDD
Oscillator	D	Q	CLK
	CLK		CLK
	CLK
	CLR
Power-on
Reset
Voltage
Detector
WDTE
WDT	WDT Timeout	Setup Time	RESET
WDT		Setup Time	RESET
/RESET

Fig. 5-28 Controller Reset Block Diagram

5.15 Interrupt

The EM78P312N has 15 interrupts (9 external, 6 internal) as listed below:

Table 9 Interrupt Vector

Interrupt Source

Enable Condition

Int. Flag

Int. Vector Priority

	Internal /	Reset	−	−	0000	High 0
	External	Reset	−	−	0000	High 0
	External
	Internal	WDT	ENI + WDTEN	WDTIF	0003	1
	External	INT0	ENI + INT0EN=1	EXIEF0	0006	2
	Internal	TCC	ENI + TCIE0=1	TCIF0	0009	3
	External	INT1	ENI + EXIE1=1	EXIF1	000F	4
	Internal	TBT	ENI + TBIE=1	TBIF	0012	5
	Internal	UART Transmit	ENI + UTIE=1	TBEF	0015	6
	Internal	UART Receive	ENI + URIE=1	TBFF	0018	7
	Internal	UART Receive error	ENI+UERRIE=1	UERRIF	001B	8
	Internal	TC3	ENI + TCIE3=1	TCIF3	0021	9
	Internal	SPI	ENI + SPIE=1	SPIF	0024	10

	Internal	TC4	ENI + TCIE4=1	TCIF4	0027	11
	External	INT3	ENI + EXIE3=1	EXIF3	002A	12

	Internal	AD	ENI + ADIE=1	ADIF	0030	13
	Internal	TC2	ENI + TCIE2=1	TCIF2	0033	14

	External	INT5	ENI + EXIE5=1	EXIF5	0036	Low 15

ISFR0, ISFR1 and ISFR2 are the interrupt status registers that record the interrupt requests in the relative flags/bits. IMR1 and IMR2 are the interrupt mask registers. The global interrupt is enabled by the ENI instruction and is disabled by the DISI instruction. When one of the interrupts (enabled) occurs, the next instruction will be fetched from individual address. The interrupt flag bit must be cleared by instructions before leaving the interrupt service routine and before interrupts are enabled to avoid recursive interrupts.

Product Specification (V1.0) 10.03.2006

• 49

(This specification is subject to change without further notice)

Image 53

IBM EM78P312N manual Interrupt, Bit Microcontroller

Contents

EM78P312N Green Product Specification8-BIT Microcontroller ELAN MICROELECTRONICS CORPAll Rights Reserved ELAN MICROELECTRONICS CORPORATIONCopyright 2006 by ELAN Microelectronics Corporation Features ContentsGeneral Description Pin AssignmentAPPENDIX Specification Revision History1 General Description 2 FeaturesPin Assignment EM78P312NSymbol Pin DescriptionEM78P312N 8-Bit Microcontroller5 Function Description 5.1 Functional Block DiagramFig. 5-1 Functional Block Diagram This specification is subject to change without further noticeThis specification is subject to change without further notice 5.2 Operating RegistersEM78P312N 8-Bit Microcontroller8-Bit Microcontroller R0 Indirect Addressing Register EM78P312NR1 Time Clock /Counter R2 Program Counter & Stack8-Bit Microcontroller EM78P312NUser Memory Space R3 Status Register8-Bit Microcontroller EM78P312NBit 0 C Carry flag R4 RAM Select Register R5 System Control RegisterBit 7 ~ Bit 6 TC4FF1 ~ TC4FF0 Timer/Counter 4 flip-flop control RB Timer/Counter 4 Control RegisterEM78P312N 8-Bit Microcontroller R6 Port 6 I/O Data RegisterRC Timer 4 Data Buffer Bit 4 ~ Bit 2 TC4CK2 ~ TC4CK 0 Timer/Counter 4 Clock Source SelectEM78P312N 8-Bit MicrocontrollerRFInterrupt Status Flag Register EM78P312N8-Bit Microcontroller RE Interrupt Status Flag Register Bit 5 ~ Bit 4 TC3CK1 ~ TC3CK0 Timer/Counter 3 Clock Source Select Bank 1 R5 TC3CR Timer/Counter 3 Control RegisterTC3M = “1” Capture mode Bank 1 R6 TC3DA Timer 3 Data Buffer A Bank 1 R7 TC3DB Timer 3 Data Buffer BBank 1 R9 TC2DH Timer 2 Data Buffer High Byte Bit 2 ~ Bit 0 TC2CK2 ~ TC2CK0 Timer/Counter 2 Clock Source SelectBank 1 RA TC2DL Timer 2 Data Buffer Low Byte TC2M Timer/Counter 2 mode selectBit 7 ~ Bit 0 ADE7 ~ ADE0 AD input pin enable control ADP = “0” Power on ADP = “1” Power downEM78P312N 8-Bit MicrocontrollerTBTEN = “0” Disable TBTEN = “1” Enable TEN = “0” Disable TEN = “1” EnableBit 2 ~ Bit 0 TBTCK2 ~ TBTCK0 Time Base Timer Clock Source Select EM78P312NEM78P312N TXE = “0” Disable TXE = “1” Enable8-Bit Microcontroller Bit 4 ~ Bit 2 BRATE2 ~ BRATE1 Transmit Baud Rate SelectBit 0 RXE Enable receiving RXE = “0” Disable RXE = “1” Enable PRE = “0” Disable PRE = “1” Enable Bit 4 PRERR Parity error flagEM78P312N 8-Bit Microcontroller8-Bit Microcontroller EM78P312NBit 5 ~ Bit 3 BRS0 ~ BRS2 SPI Clock Source Select EDS = “0” Rising edge EDS = “1” Falling edge8-Bit Microcontroller EM78P312NBit 2 ~ Bit 1 SPIM1 ~ SPIM0 SPI Transfer Mode Select BankPHE7x = “0” Enable P7x pull high 5.3 Special Purpose RegistersPHE7x = “1” Disable P7x pull high WDTE = “0” Disable WDTE = “1” EnableEM78P312N Bit 6 INT0EN INT0 enable control INT0EN = “0” General I/O8-Bit Microcontroller Bit 2 PSR2 ~ Bit 0 PSR0 TCC prescaler bits IOC6 ~ IOC9 − I/O Port Control Register8-Bit Microcontroller EM78P312NADOSCR − AD Offset Control Register Address 0Ch Bit 5 ~ Bit 3 VOF2 ~ VOF0 Offset voltage bitsEM78P312N Bit 1 SPIE SPI Interrupt enable bit8-Bit Microcontroller IMR2 − Interrupt Mask Register 2 Address 0Fh8-Bit Microcontroller 5.4 CPU Operation ModeEM78P312N EM78P312N 5.5 AD Converter8-Bit Microcontroller Table 4. Wake-up Methods8-Bit Microcontroller EM78P312NADC Data Register A/D Sampling TimeFig. 5-6 Tone Output Pin Configuration 5.6 Time Base Timer and Keytone GeneratorFig. 5-7 Tone Output Pin Timing Chart EM78P312NFig. 5-9 Time Base Timer Timing Chart Fig. 5-8 TBT ConfigurationEM78P312N 8-Bit MicrocontrollerFig. 5-10 Function Block Diagram 5.7 UART Universal Asynchronous Receiver/TransmitterEM78P312N 8-Bit Microcontroller5.7.2 Transmitting 5.7.1 UART ModeEM78P312N 8-Bit Microcontroller5.7.4 Baud Rate Generator 5.7.3 ReceivingEM78P312N 8-Bit MicrocontrollerFig. 5-13 SPI Block Diagram 5.8 SPI Serial Peripheral InterfaceThis specification is subject to change without further notice EM78P312N5.8.1 Serial Clock 5.8.2 Shift Direction and Sample Phase5.8.3 Transfer Mode EM78P312Nc 8-bit Transmit/Receive Mode EM78P312N8-Bit Microcontroller b 8-bit Receive Mode 8-Bit Microcontroller EM78P312Nd Multiple Device Connect /SS SCK pinRegisters for Timer/Counter 2 Circuit 5.9 Timer/CounterFig. 5-18 Configuration of Timer/Counter EM78P312N5.9.2 Counter Mode 5.9.1 Timer Mode5.9.3 Window Mode EM78P312NRegisters for Timer/Counter 3 Circuit 5.10 Timer/CounterFig. 5-21 Window Mode Timing Chart EM78P312N5.10.2 Counter Mode 5.10.1 Timer Mode5.10.3 Capture Mode EM78P312N8-Bit Microcontroller 5.11 Timer/CounterEM78P312N 5.11.2 Counter Mode 5.11.1 Timer Mode5.11.3 PDO Mode EM78P312N5.11.4 PWM Mode 5.12 TCC/WDT & PrescalerEM78P312N 8-Bit Microcontroller5.14.1 Reset 5.14 Reset and Wake-up5.13 I/O Ports EM78P312N5.14.3 Wake-up from Idle Mode 5.14.2 Wake-up from Sleep ModeEM78P312N 8-Bit MicrocontrollerThis specification is subject to change without further notice Reset TypeEM78P312N 8-Bit MicrocontrollerThis specification is subject to change without further notice Reset TypeEM78P312N 8-Bit Microcontroller Register BankThis specification is subject to change without further notice Reset TypeEM78P312N 8-Bit Microcontroller Register BankReset Type Reset TypeThis specification is subject to change without further notice EM78P312N8-Bit Microcontroller General Purpose Registers 5.14.4 The Status of RST, T, and P of the Status RegisterEM78P312N 8-Bit Microcontroller 5.15 InterruptEM78P312N 5.16.1 Oscillator Modes 5.16 Oscillator5.16.2 Crystal Oscillator/Ceramic Resonators Crystal EM78P312N8-Bit Microcontroller EM78P312NOSCI XTALEM78P312N 5.16.3 External RC Oscillator Mode8-Bit Microcontroller Crystal/Resonator-Parallel Mode Circuit5.17.1 Code Option Register Word 5.17 Code Option RegisterENWDTB = “0” Enable ENWDTB = “1” Disable EM78P312N5.18.1 External Power-on Reset Circuit 5.18 Power-on Considerations5.17.2 Customer ID Register HLP = “0” Low power HLP = “1” High powerRESET 5.18.2 Residue-Voltage ProtectionEM78P312N 8-Bit Microcontroller8-Bit Microcontroller 5.19 Instruction SetEM78P312N 8-Bit Microcontroller EM78P312N6.1 Absolute Maximum Ratings 6 Absolute Maximum Ratings6.2 Recommended Operating Conditions EM78P312N7.1 DC Electrical Characteristics 7 Electrical CharacteristicsEM78P312N 8-Bit MicrocontrollerTa= 25 C, VDD= 3.0V ± 5%, VSS= EM78P312N8-Bit Microcontroller 8-Bit Microcontroller EM78P312NEM78P312N 7.2 AC Electrical Characteristic8-Bit Microcontroller Ta=- 40C ~ 85 C, VDD=5V ± 5%, VSS=0VRESET Timing CLK=0 7.3 Timing DiagramThis specification is subject to change without further notice EM78P312NEM78P312N APPENDIX A Package Types8-Bit Microcontroller OTP MCU