EM78P372KSS20 datasheet(46/118 Pages) EMC

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EM78P372K

8-bit Microcontroller



Product Specification (V1.4) 05.11.2016

(This specification is subject to change without prior notice)

7.4.1 Usage of Ports 5, 7 Input Change Wake-up/Interrupt Function

(1) Wake-up

(2) Wake-up and Interrupt

(a) Before Sleep

1. Disable WDT

2-1. Read I/O Port 5 (MOV R5,R5)

2-2. Read I/O Port 7 (MOV R7,R7)

3. Execute "ENI" or "DISI"

4. Enable wake-up bit (Set RE ICWE =1)

4. Enable wake-up bit (Set RE

ICWE =1)

5. Execute "SLEP" instruction

5. Enable interrupt (Set IOCF ICIE =1)

(b) After wake-up

6. Execute "SLEP" instruction

 Next instruction

(b) After wake-up

1. IF "ENI"

 Interrupt vector (008H)

2. IF "DISI"

 Next instruction

(3) Interrupt

(a) Before Port 5,7 pin change

1-1. Read I/O Port 5 (MOV R5,R5)

1-2. Read I/O Port 7 (MOV R7,R7)

2. Execute "ENI" or "DISI"

3. Enable interrupt (Set IOCF ICIE =1)

(b) After Port 5,7 pin changed (interrupt)

1. IF "ENI"

 Interrupt vector (006H)

2. IF "DISI"

 Next instruction

7.5

Reset and Wake-up

7.5.1 Reset and Wake-up Operation

A reset is initiated by one of the following events:

1. Power-on reset

2. /RESET pin input "low"

3. WDT time-out (if enabled)

The device is kept in reset condition for a period of approximately 18ms

3 (except in LXT

mode) after the reset is detected. When in LXT2 mode, the reset time is 500ms. Two

choices (18ms

3 or 4.5ms4) are available for WDT-time out period. Once a reset occurs,

the following functions are performed (the initial Address is 000h):



The oscillator continues running, or will be started (if in sleep mode).



The Program Counter (R2) is set to all "0".

VDD=5V, Setup time period = 16.5ms ± 30%

VDD=3V, Setup time period = 18ms ± 30%

VDD=5V, Setup time period = 4.2ms ± 30%

VDD=3V, Setup time period = 4.5ms ± 30%

EM78P372KSS20 Datasheet(PDF) 46 Page - ELAN Microelectronics Corp

EM78P372KSS20 Datasheet(HTML) 46 Page - ELAN Microelectronics Corp

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