em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 26

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

This specification is subject to change without prior notice.
10. IOCE0 (WDT Control Register)
11. IOCF0 (Interrupt Mask Register)
• Bit 0 (/PH50) Use to enable the pull-high of P50 pin.
• IOCD0 Register is both readable and writable.
• Bit 7 (WDTE) Control bit is used to enable Watchdog timer.
• Bit 6 (EIS) Control bit is used to define the function of P60(/INT) pin.
• Bit5~3 Not used.
• Bit 2 (PSW2) ~ Bit 0 (PSW0) WDT prescaler bits.
• Bit 7 (CMP4IE) CMP3IF interrupt enable bit.
• Bit 6 (CMP3IE) CMP3IF interrupt enable bit.
• Bit 5 (CMP2IE) CMP2IF interrupt enable bit.
0: Disable WDT.
1: Enable WDT.
WDTE is both readable and writable.
0: P60, bi-directional I/O pin.
1: /INT, external interrupt pin. In this case, the I/O control bit of P60 (bit 0 of IOC6) must be set to "1".
When EIS is "0", the path of /INT is masked. When EIS is "1", the status of /INT pin can also be read
by way of reading Port 6 (R6). Refer to Fig. 8.
EIS is both readable and writable.
0: disable CMP4IF interrupt
1: enable CMP4IF interrupt
0: disable CMP3IF interrupt
1: enable CMP3IF interrupt
WDTE
CMP4IE
PSW2
7
0
0
0
0
1
1
1
1
7
PSW1
CMP3IE
EIS
0
0
1
1
0
0
1
1
6
6
PSW0
CMP2IE
0
1
0
1
0
1
0
1
5
-
5
WDT Rate
1:128
1:16
1:32
1:64
CMP1IE
1:1
1:2
1:4
1:8
4
-
4
26
PPC/CMP
3
-
3
PSW2
EXIE
2
2
PSW1
ICIE
EM78P257
1
1
07.27.2004 (V1.4)
OTP ROM
PSW0
TCIE
0
0