Preliminary
SN8P1702A/SN8P1703A
8-bit micro-controller build-in 12-bit ADC
TC0M MODE REGISTER
The TC0M is the timer counter mode register, which is an 8-bit read/write register. By loading different value into the
TC0M register, users can modify the timer counter clock frequency dynamically when program executing.
Eight rates for TC0 timer can be selected by TC0RATE0 ~ TC0RATE2 and TC0X8 bits of T0M register. If TC0X8=1 the
TC0 will faster 8 times than TC0X8=0 (Initial value). The bit7 of TC0M named TC0ENB is the control bit to start TC0
timer.
TC0M initial value = 0000 0000
0DAH
TC0M
Bit 7
TC0ENB TC0RATE2 TC0RATE1 TC0RATE0 TC0CKS
R/W R/W R/W R/W R/W
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
ALOAD0
R/W
Bit 1
TC0OUT PWM0OUT
R/W R/W
Bit 0
Bit7
TC0ENB: TC0 counter/BZ0/PWM0OUT enable bit.
0 = disable,
1 = enable.
Bit [6:4] TC0RATE[2:0]: TC0 clock source selection bits. TC0X8 is bit 2 of T0M register.
TC0 Clock Source
TC0RATE [2:0]
TC0X8 = 0
TC0X8 = 1
000
001
…
Fcpu/256 = Fosc/1024 Fosc/128
Fcpu/128 = Fosc/512 Fosc/64
…
…
110
111
Fcpu/4 = Fosc/16
Fcpu/2 = Fosc/8
Fosc/2
Fosc
Note: Fcpu = Fosc / 4
Bit3
Bit2
Bit1
Bit0
ꢀ
TC0CKS: TC0 clock source select bit.
0 = Fcpu,
1 = External clock comes from INT0/P0.0 pin.
ALOAD0: TC0 auto-reload function control bit.
0 = none auto-reload,
1 = auto-reload.
TC0OUT: TC0 time-out toggle signal output control bit.
0 = to disable TC0 signal output and to enable P5.4’s I/O function,
1 = to enable TC0’s signal output and to disable P5.4’s I/O function. (Auto-disable the PWM0OUT function.)
PWM0OUT: TC0’s PWM output control bit.
0 = to disable the PWM output,
1 = to enable the PWM output (The TC0OUT control bit must = 0 )
Note: When TC0CKS=1, TC0 became an external event counter. No more P0.0 interrupt request will be
raised. (P0.0IRQ will be always 0)
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Revision 0.5
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