EM78159NAS EMC [ELAN Microelectronics Corp], EM78159NAS Datasheet - Page 28

• Manufacturer Part Number: EM78159NAS
• Description: 8-Bit Microcontroller with OTP ROM
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78P159N
8-Bit Microcontrollerwith OTP ROM
24 •
4.5.3 The Status of RST, T, and P of STATUS Register
A RESET condition is initiated by the following events
1) A power-on condition,
2) A high-low-high pulse on /RESET pin, and
3) Watchdog timer time-out.
The values of T and P listed in the table below are used to check how the processor
wakes up.
The following table shows the events that may affect the status of T and P.
Power on
WDTC instruction
WDT time-out
SLEP instruction
Wake-Up on 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 pin change during SLEEP mode
The Values of RST, T, and P after RESET
The Status of T and P Being Affected by Events
WDTE
Power-on
Voltage
Detector
Reset
/RESET
Oscillator
Reset Type
Event
WDT
Figure 4-6 Controller Reset Block Diagram
WDT Timeout
(This specification is subject to change without further notice)
VDD
D
Product Specification (V1.0) 03.10.2006
CLK
CLR
Q
Setup Time
*
*
P: Previous status before reset
P: Previous status before reset
*
T
1
1
0
0
1
T
1
1
0
1
1
P
RESET
*
*
*
P
1
0
0
0
P
1
1
0
0
P
P
P
CLK