SN8A1702AX datasheet(57/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

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

SONiX TECHNOLOGY CO., LTD

Page 57

Revision 0.5

TC0C COUNTING REGISTER

TC0C is an 8-bit counter register for the timer counter (TC0). TC0C must be reset whenever the TC0ENB is set “1” to

start the timer counter. TC0C is incremented by one with a clock pulse which the frequency is determined by

TC0RATE0 ~ TC0RATE2. When TC0C has incremented to “0FFH”, it is will be cleared to “00H” in next clock and an

overflow is generated. Under TC0 interrupt service request (TC0IEN) enable condition, the TC0 interrupt request flag

will be set “1” and the system executes the interrupt service routine.

TC0C initial value = xxxx xxxx

0DBH

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TC0C

TC0C7

TC0C6

TC0C5

TC0C4

TC0C3

TC0C2

TC0C1

TC0C0

R/W

TC0 Overflow Time

TC0 rate is determinate by TC0Rate and Code Option TC0_Counter, TC0Rate can set TC0 clock frequency and

TC0_Counter set TC0 became 8-bit, 6-bit, 5-bit or 4-bit counter.

The equation of TC0C initial value is as following.

TC0C initial value = N

- (TC0 interrupt interval time * input clock)

Which N is determinate by code option: TC0_Counter

TC0_Counter

Max. TC0C value

8-bit

256

255

6-bit

5-bit

4-bit

Note: TheTC0C must small or equal than Max. TC0 value.

Example: To set 10ms interval time for TC0 interrupt at Fosc = 3.58MHz

TC0C value (74H) = 256 - (10ms * fcpu/64)

(TC0RATE=010, TC0_Counter=8-bit, TC0X8=0)

TC0C initial value = 256 - (TC0 interrupt interval time * input clock)

= 256 - (10ms * 3.58 * 106 / 4 / 64)

= 256 - (0.01 * 3.58 * 106 / 4 / 64)

= 116

= 74H

Example: To set 1.25ms interval time for TC0 interrupt at Fosc = 3.58MHz

TC0C value (74H) = 256 - (10ms * fcpu/64)

(TC0RATE=010, TC0_Counter=8-bit, TC0X8=1)

TC0C initial value = 256 - (TC0 interrupt interval time * input clock)

= 256 - (1.25ms * 3.58 * 106 / 32)

= 256 - (0.00125 * 3.58 * 106 / 32)

= 116

= 74H

Example: To set 1ms interval time for TC0 interrupt at Fosc = 3.58MHz

TC0C value (32H) = 64 - (1ms * fcpu/64)

(TC0RATE=010, TC0_COunter=6-bit, TC0X8=0)

TC0C initial value = 64 - (TC0 interrupt interval time * input clock)

= 64 - (1ms * 3.58 * 106 / 4 / 64)

= 64 - (0.001 * 3.58 * 106 / 4 / 64)

= 64 - 14

= 32H

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