em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 34

• Manufacturer Part Number: em78p257
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

This specification is subject to change without prior notice.
Table 6 Summary of the Initialized Values for Registers
Address
N/A
N/A
N/A
N/A
N/A
N/A
In a similar way, if the Comparator Status Changed Interrupt is used to wake-up the EM78P257A/B , the following
instructions must be executed before SLEP:
One problem user must be aware of, is that after waking up from the sleep mode, WDT will enable automatically.
The WDT operation (being enabled or disabled) should be handled appropriately by software after waking up from
the sleep mode.
(CMPCR)
(TCCCR)
(COICS)
Name
IOC50
IOC60
IOC70
IOC80
IOC90
IOCA0
MOV A, @0bxx000110
CONTW
CLR R1
MOV A, @0bxxxx1110
CONTW
WDTC
MOV A, @0b0xxxxxxx
IOW RE
MOV A, @0b1111xxxx
IOW RF
ENI (or DISI)
SLEP
NOP
Wake-Up from Pin
Wake-Up from Pin
Wake-Up from Pin
Wake-Up from Pin
Wake-Up from Pin
/RESET and WDT
/RESET and WDT
/RESET and WDT
/RESET and WDT
/RESET and WDT
/RESET and WDT
Reset Type
Power-On
Power-On
Power-On
Power-On
Power-On
Power-On
Bit Name
Bit Name
Bit Name
Bit Name
Bit Name
Bit Name
Change
Change
Change
Change
Change
TCC2E TCC4E TCC6E TCCBE
COIE4
Bit 7
C57
C67
; Select internal TCC clock
; Clear TCC and prescaler
; Select WDT prescaler
; Clear WDT and prescaler
; Disable WDT
; Enable comparator high interrupt
; Enable (or disable) global interrupt
; Sleep
1
1
P
1
1
P
X
1
1
P
0
0
P
0
0
P
X
1
1
COIE3
Bit 6
C76
C66
1
1
P
1
1
P
X
1
1
P
0
0
P
0
0
P
X
1
1
34
COIE2
Bit 5
C55
C65
1
1
P
1
1
P
X
1
1
P
0
0
P
0
0
P
X
1
1
COIE1
Bit 4
C54
C64
1
1
P
1
1
P
X
1
1
P
0
0
P
0
0
P
X
1
1
Bit 3
C53
C63
CE4
CI3
1
1
P
1
1
P
X
1
1
P
X
0
0
P
0
0
P
0
0
Bit 2
C52
C62
CE3
CI2
1
1
P
1
1
P
X
1
1
P
X
0
0
P
0
0
P
0
0
EM78P257
07.27.2004 (V1.4)
OTP ROM
Bit 1
C51
C61
C71
CE2
CI1
1
1
P
1
1
P
1
1
P
X
0
0
P
0
0
P
0
0
Bit 0
C50
C60
C70
CE1
CI0
1
1
P
1
1
P
1
1
P
X
0
0
P
0
0
P
0
0