IBM EM78P447N manual Usage of Sleep1 and Sleep2 Mode, SLEEP2 SLEEP1

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EM78P447N

8-Bit Microcontroller with OTP ROM

(A)Any of the wake-up pins is “0” as illustrated in Figure. 5. Upon waking, the controller will continue to execute the succeeding address. Under this case, before entering SLEEP2 MODE, the wake-up function of the trigger sources (P60~P67 and P74~P75) should be selected (e.g., input pin) and enabled (e.g., pull-high, wake-up control). It should be noted that after waking up, the WDT is enabled if the Code Option bit ENWDT is “0”. The WDT operation (to be enabled or disabled) should be appropriately controlled by software after waking up.

(B)WDT time-out (if enabled) or external reset input on /RESET pin will trigger a controller reset.

Table 6 Usage of Sleep1 and Sleep2 Mode

Usage of Sleep1 and Sleep2 Mode

SLEEP2

SLEEP1

(a) Before SLEEP		(a) Before SLEEP
1.	Set Port6 or P74 or P75 Input	1. Execute SLEP instruction
2.	Enable Pull-High and set WDT
prescaler over 1:1 (Set CONT.7 and
CONT.3 ~ CONT.0)
3.	Enable Wake-up (Set IOCB or IOCE.0)
4.	Execute Seep2 (Set IOCE.4)
(b) After Wake-up		(b) After Wake-up
1.	Next instruction	1. Reset
2.	Disable Wake-up
3.	Disable WDT (Set IOCE.5)

If Port6 Input Status Changed Wake-up is used to wake-up the EM78P447S (Case [a] above), the following instructions must be executed before entering SLEEP2 mode:

MOV	A, @11111111b
IOW	R6
MOV	A, @0xxx1010b
CONTW

;Set Port6 input

;Set Port6 pull-high, WDT prescaler, prescaler must set over 1:1

MOV	A, @00000000b	; Enable Port6 wake-up function
IOW	RB	; Enable SLEEP2
MOV	A, @xx00xxx1b	; Enable SLEEP2
IOW	RE
After
Wake-up
NOP
MOV	A, @11111111b	; Disable Port6 wake-up function
IOW	RB
MOV	A, @ xx01xxx1b	; Disable WDT
IOW	RE

18 •	Product Specification (V1.1) 03.30.2005

(This specification is subject to change without further notice)

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Contents EM78P447N Elan Microelectronics Corporation Contents Specification Revision History General Description EM78P447NBWM PIN Assignment EM78P447NAP and EM78P447NAM Pin Description Symbol Pin No Type FunctionEM78P447NAS Pin Description EM78P447NBP and EM78P447NBWM Pin Description Power supplyEM78P447NCK and EN78P447NCM Pin Description Function Description EM78P447NDK and EM78P447NDM Pin Description2 R1 Time Clock /Counter Operational Registers1 R0 Indirect Addressing Register 3 R2 Program Counter & StackCall RET Retl Reti FffhData Memory Configuration 7 R8~R1F and R20~R3E General Purpose Register 5 R4 RAM Select Register6 R5~R7 Port 5 ~ Port7 R5, R6 and R7 are I/O registersAccumulator Special Purpose Registers8 R3F Interrupt Status Register Control RegisterTCC Rate 3 IOC5 ~ IOC7 I/O Port Control RegisterIocb Wake-up Control Register for Port6 WDT RateIoce WDT Control Register WUEIocf Interrupt Mask Register ExieTCC and WDT Block Diagram TCC/WDT & PrescalerI/O Ports IODReset and Wake-up ResetUsage of Sleep1 and Sleep2 Mode SLEEP2 SLEEP1Address Name Reset Type Bit Summary of the Initialized Values for RegistersWUE7 WUE6 WUE5 WUE4 R3FISRExif Tcif IocbStatus of RST, T, and P of Status Register Previous status before resetPrevious value before reset Events that may Affect the T and P StatusController Reset Block Diagram InterruptOscillator Modes OscillatorMode Conditions Crystal Oscillator/Ceramic ResonatorsXTALSummary of Maximum Operating Speeds Fxt max.MHzHXT External RC Oscillator ModeOscillator Type Frequency Mode C1pF C2pF LXTCode Option Register Code Option Register WordPR2~PR0 are protect bits, protect type as following ProtectCustomer ID Register Word Power On ConsiderationsExternal Power On Reset Circuit Bit 12~0 Customer’s ID codeReset Residue-Voltage ProtectionInstruction Set Contw NOPDAA SlepRrca R Djza RDJZ R RRC RTiming Diagram AC Test Input/Output W aveformTa= 25 C, VDD= 5.0V±5%, VSS= DC Electrical CharacteristicSymbol Parameter Condition Min Typ Max Unit Items RatingSymbol Parameter Conditions Min Typ Max Unit AC Electrical CharacteristicTa=- -40 C ~ 85 C, VDD=5V ±5%, VSS=0V Device characteristic Vih, Vil of TCC, /INT, /RESET PinPort5, Port6 Port7 Voh vs. Ioh,VDD=5V Port5, Port6, and Port7 Voh vs. Ioh, VDD=3V Vol/Iol VDD=5V Vol/Iol VDD=3V Vol/Iol 100 Vol/Iol WDT Cext=100pF, Typical RC OSC Frequency Typical ICC1 and ICC2 vs. Temperature Maximum ICC1 and ICC2 vs. Temperature Typical ISB1 and ISB2 vs. Temperature Maximum ISB1 and ISB2 vs. Temperature EM78P447N HXT ImA Lead plastic dual inline package（DIP）－ 300 mil Package Type Pin Count Package SizeLead plastic dual inline skinny package（DIP）－ 300 mil Lead plastic dual inline package（DIP）－ 600 mil838 27TYP EM78P447N