em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 57

• Manufacturer Part Number: em78p809n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

General Purpose Registers
X: Not used. U: Unknown or don’t care. P: Previous value before reset. t: Check Table 7
(*) 0: Wake-Up from SLEEP P: Wake-Up from IDLE
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
Address Name
0x10
0x3F
~
R10
R3F
~
4.14.4
Bit Name
Power-On
/RESET and WDT time out
Wake-Up from SLEEP, IDLE mode
The values of T and P are used to verify the event that triggered the processor to wake
up. Table 7 shows the events that may affect the status of T and P.
Table 7. The Values of RST, T and P after RESET
*P: Previous status before reset
Table 8 The Events that may Affect the T and P Status
*P: Previous value before reset
Power on
/RESET during Operation mode
/RESET wake-up during SLEEP mode
/RESET wake-up during IDLE mode
WDT during Operation mode
WDT wake-up during SLEEP mode
WDT wake-up during IDLE mode
Power on
WDTC instruction
WDT time-out
SLEP instruction
Wake-Up during SLEEP mode
Reset Type
The Status of RST, T, and P of STATUS Register
Reset Type
Event
Bit 7
U
P
P
-
Bit 6
U
P
P
-
Bit 5
U
P
P
-
Bit 4
U
P
P
-
Bit 3
U
P
P
-
*P
*P
*P
*P
T
1
0
T
8-Bit Microcontroller
0
0
1
1
0
1
Bit 2
U
P
P
-
EM78P809N
Bit 1
U
P
P
-
*P
*P
*P
*P
*P
*P
*P
*P
P
P
1
1
1
0
Bit 0
U
P
P
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