em78p164n ELAN Microelectronics Corp, em78p164n Datasheet - Page 37

• Manufacturer Part Number: em78p164n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.4) 05.28.2010
(This specification is subject to change without further notice)
Table 5-3 Values of RST, T and P after Reset
5.5.3 /RESET Configuration
Refer to Figure 5-8 when the reset bit in the Option word is programmed to 0, the
external /RESET is enabled. When programmed to 1, the internal /RESET is enabled,
tied to the internal Vdd and the pin is defined as P63.
5.5.4 Status of RST, T, and P of the Status Register
A reset condition is initiated by the following events:
1. Power-on condition
2. High-low-high pulse on /RESET pin
3. Watchdog timer time-out
The values of RST, T and P, listed in Table 5-2 are used to check how the processor
wakes up.
Table 5-4 shows the events which may affect the status of RST, T and P.
Table 5-4 Status of RST, T and P being Affected by Events
Power on
WDTC instruction
WDT time-out
SLEP instruction
Wake-up on a pin change during Sleep mode
Power on
/RESET during Operating mode
/RESET wake-up during Sleep mode
WDT during Operating mode
WDT wake-up during Sleep mode
Wake-up on a pin change during Sleep mode
Reset Type
Event
8-Bit Microcontroller with OTP ROM
RST
RST
*P
*P
*P: Previous status before reset
0
0
1
0
0
0
0
0
1
*P: Previous value before reset
*P
T
1
1
0
1
1
T
1
1
0
0
1
EM78P164N
*P
*P
P
1
1
0
P
P
0
1
0
0
0
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