IBM EM78P312N manual The Status of RST, T, and P of the Status Register

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
0x10	R10	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
0x3F	R3F
		Wake-up from Sleep, Idle mode	P	P		P	P	P	P	P	P
		Legend: “⋅” = not used			“P” = previous value before reset
		“u” = unknown or don’t care			“t” = check Table 7

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		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

48 • Product Specification (V1.0) 10.03.2006

(This specification is subject to change without further notice)