EM78P312N
8-Bit Microcontroller
General Purpose Registers
Address Name
Reset Type
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit Name
Power-on
-
-
-
-
-
-
-
-
0x10
~
R10
~
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
U
P
P
/RESET and WDT time out
0x3F
R3F
Wake-up from Sleep, Idle mode
Legend: “×” = not used
“P” = previous value before reset
“t” = check Table 7
“u” = unknown or don’t care
5.14.4 The Status of RST, T, and P of the Status Register
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 a reset
Reset Type
T
P
Power on
1
*P
*P
*P
0
1
/RESET during Operation mode
/RESET wake-up during Sleep mode
/RESET wake-up during Idle mode
WDT during Operation mode
*P
*P
*P
*P
*P
*P
WDT wake-up during Sleep mode
WDT wake-up during Idle mode
*P: Previous status before reset
0
0
Table 8 The Events that may affect the T and P Status
Event
T
P
Power on
1
1
1
1
WDTC instruction
WDT time-out
0
*P
0
SLEP instruction
1
Wake-Up during Sleep mode
*P: Previous value before reset
*P
*P
48 •
Product Specification (V1.0) 10.03.2006
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
