IBM EM78P809N TC3DB − Timer 3 Data Buffer B Address 07h, TC2M = 1 Window mode, TC2S = 1 Start

EM78P809N

8-Bit Microcontroller

Bit 5 ~ Bit 4 ( TC3CK1 ~ TC3CK0 ) : Timer/Counter3 Clock Source Select

TC3CK1	TC3CK0	Clock source	Resolution	Max. time
		( Normal, Idle )	( Fc=8M )	( Fc=8M )
0	0	Fc/212	512μS	131.1mS
0	1	Fc/210	128μS	32.6mS
1	0	Fc/27	16μS	4.1mS
1	1	External clock (TC3 pin)	-	-

Bit 3 ( TC3M ) : Timer/Counter 3 mode select

TC3M = “0” : Timer/Counter3 mode

TC3M = “1” : Capture mode

TC3DA − Timer 3 Data Buffer A ( Address: 06h )

Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
TC3DA7	TC3DA6	TC3DA5	TC3DA4	TC3DA3	TC3DA2	TC3DA1	TC3DA0

Bit 7 ~ Bit 0 ( TC3DA7 ~ TC3DA0 ) : Data buffer of 8-bit Timer/Counter 3.

Reset does not affect this register.

TC3DB − Timer 3 Data Buffer B ( Address: 07h )

Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
TC3DB7	TC3DB6	TC3DB5	TC3DB4	TC3DB3	TC3DB2	TC3DB1	TC3DB0

Bit 7 ~ Bit 0 ( TC3DB7 ~ TC3DB0 ) : Data buffer of 8-bit Timer/Counter 3

Reset does not affect this register.

TC2CR/ ADDL — Timer/Counter 2 Control Register, AD Low 2 bits Data

Buffer ( Address: 08h )

Bit 7	Bit 6	Bit	5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
ADD1	ADD0	0		TC2M	TC2S	TC2CK2	TC2CK1	TC2CK0

Bit 7 ~ Bit 6 ( ADD1 ~ ADD0 ) : AD low 2-bit data buffer

Bit 4 ( TC2M ) : Timer/Counter 2 mode select

TC2M = “0” : Timer/counter mode

TC2M = “1” : Window mode

Bit 3 ( TC2S ) : Timer/Counter 2 start control

TC2S = “0” : Stop and counter clear

TC2S = “1” : Start

14 • Product Specification (V1.0) 07.26.2005

(This specification is subject to change without further notice)