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EM78P809N
8-Bit Microcontroller
Product Specification (V1.0) 07.26.2005
• 53
(This specification is subject to change without further notice)
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 U U U U U U U U
/RESET and WDT time out P P P P P P P P
0x10
~
0x3F
R10
~
R3F
Wake-Up from SLEEP, IDLE mode P P P P P P P P
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
4.14.4 The Status of RST, T, and P of 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 RESET
Reset Type T P
Power on 1 1
/RESET during Operation mode *P *P
/RESET wake-up during SLEEP mode *P *P
/RESET wake-up during IDLE mode *P *P
WDT during Operation mode 0 *P
WDT wake-up during SLEEP mode 0 *P
WDT wake-up during IDLE mode 0 *P
*P: Previous status before reset
Table 8 The Events that may Affect the T and P Status
Event T P
Power on 1 1
WDTC instruction 1 1
WDT time-out 0 *P
SLEP instruction 1 0
Wake-Up during SLEEP mode *P *P
*P: Previous value before reset