Sonic Alert msm85c154hvs, msm83c154s Special function registers 4.4.2.1 Timer mode register Tmod

INTERNAL SPECIFICATIONS

4.4.2Special function registers 4.4.2.1 Timer mode register (TMOD)

Name	Address	MSB								LSB
			7	6	5	4	3	2	1		0
TMOD	89H	GATE		C/T	M1	M0	GATE	C/T	M1		M0
Bit location	Flag					Function
TMOD.0	M0	M1 M0		Timer/counter 0 mode setting
		0	0	8-bit timer/counter with 5-bit prescalar
		0	1	16-bit timer/counter
		1	0	8-bit timer/counter with 8-bit auto reloading
TMOD.1	M1
		1	1	Timer/counter 0 separated into TL0 (8-bit) timer/counter
				and TH0 (8-bit) timer/counter. TF0 is set by TL0 carry,
				and TF1 is set by TH0 carry.
TMOD.2	C/T	Timer/counter 0 count clock designation control bit.
		XTAL1·2 divided by 12 clock is the input applied to timer/counter 0
		when C/T="0".
		The external clock applied to the T0 pin is the input applied to
		timer/counter 0 when C/T="1".
TMOD.3	GATE	When this bit is "0", the TR0 bit of TCON (timer control register) is
		used to control the start and stop of timer/counter 0 counting. If
		this bit is "1", timer/counter 0 starts counting when both the TR0 bit
		of TCON and INT0 pin input signal are "1", and stops counting
		when either is changed to "0".
TMOD.4	M0	M1 M0		Timer/counter 1 mode setting
		0	0	8-bit timer/counter with 5-bit prescalar
		0	1	16-bit timer/counter
		1	0	8-bit timer/counter with 8-bit auto reloading
TMOD.5	M1
		1	1	Timer/counter 1 operation stopped
TMOD.6	C/T	Timer/counter 1 count clock designation control bit.
		XTAL1·2 divided by 12 clock is the input applied to timer/counter 1
		when C/T="0".
		The external clock applied to the T1 pin is the input applied to
		timer/counter 1 when C/T="1".
TMOD.7	GATE	When this bit is "0", the TR1 bit of TCON is used to control the
		start and stop of timer/counter 1 counting.
		If this bit is "1", timer/counter 1 starts counting when both the TR1
		bit of TCON and INT1 pin input signal are "1", and stops counting
		when either is changed to "0".

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