SN8A1702AX datasheet(56/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 56

Revision 0.5

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

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TC0M

TC0ENB

TC0RATE2 TC0RATE1 TC0RATE0

TC0CKS

ALOAD0

TC0OUT

PWM0OUT

R/W

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

Fcpu/256 = Fosc/1024 Fosc/128

001

Fcpu/128 = Fosc/512

Fosc/64

…

110

Fcpu/4

= Fosc/16

Fosc/2

111

Fcpu/2

= Fosc/8

Fosc

Note: Fcpu = Fosc / 4

Bit3

TC0CKS: TC0 clock source select bit.

0 = Fcpu,

1 = External clock comes from INT0/P0.0 pin.

Bit2

ALOAD0: TC0 auto-reload function control bit.

0 = none auto-reload,

1 = auto-reload.

Bit1

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.)

Bit0

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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