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EM78P451SWM Datasheet(PDF) 37 Page - ELAN Microelectronics Corp

Part # EM78P451SWM
Description  8-Bit Microcontroller with OTP ROM
PDF  54 Pages
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P451SWM Datasheet(HTML) 37 Page - ELAN Microelectronics Corp

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EM78P451S
8-Bit Microcontroller with OTP ROM
Product Specification (V1.0) 06.01.2004
• 33
(This specification is subject to change without further notice)
Table 6 Usage of Sleep and Sleep2 Mode
Usage of Sleep and Sleep2 Mode
SLEEP2
SLEEP
(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 EM78P451S (Case [a] above), the
following instructions must be executed before entering SLEEP2 mode:
MOV
A, @11111111b
; Set Port6 input
IOW
IOC6
MOV
A, @0xxx1010b
; Set Port6 pull-high, WDT prescaler, prescaler must set over 1:1
CONTW
MOV
A, @xx00xxx0b
; Enable Port6 wake-up function, Enable SLEEP2
IOW
IOCE
After Wake-up
NOP
MOV
A, @ xx01xxx1b
; Disable Port6 wake-up function; Disable WDT
IOW
IOCE
After waking up from the SLEEP2 mode, WDT is automatically enabled. The WDT enabled/disabled
operation after waking up from SLEEP2 mode should be appropriately defined in the software.
To avoid a reset from occurring when the Port 6 Input Status Changed Interrupt enters into interrupt
vector or is used to wake-up the MCU, the WDT prescaler must be set above the 1:1 ratio.
Table 7 The Summary of the Initialized Values for Registers
Address
Name
Reset Type
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit Name
C57
C56
C55
C54
C53
C52
C51
C50
N/A
IOC5
Power-On
1
1
1
1
1
1
1
1
/RESET and WDT
1
1
1
1
1
1
1
1
Wake-Up from Pin
Change
P
P
P
P
P
P
P
P
Bit Name
C67
C66
C65
C64
C63
C62
C61
C60
N/A
IOC6
Power-On
1
1
1
1
1
1
1
1
/RESET and WDT
1
1
1
1
1
1
1
1
Wake-Up from Pin
Change
PPPPP
P
P
P
Bit Name
C77
C76
C75
C74
C73
C72
C71
C70
N/A
IOC7
Power-On
1
1
1
1
1
1
1
1
/RESET and WDT
1
1
1
1
1
1
1
1
Wake-Up from Pin
Change
PPPPP
P
P
P
Bit Name
C87
C86
C85
C84
C83
C82
C81
C80
N/A
IOC8
Power-On
1
1
1
1
1
1
1
1
/RESET and WDT
1
1
1
1
1
1
1
1



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