SN8A1702AX datasheet(68/112 Pages) SONIX

68 / 112 page

Preliminary

SN8P1702A/SN8P1703A

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

SONiX TECHNOLOGY CO., LTD

Page 68

Revision 0.5

TC1C COUNTING REGISTER

TC1C is an 8-bit counter register for the timer counter (TC1). TC1C must be reset whenever the TC1ENB is set “1” to

start the timer. 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 TC1 interrupt service request (TC1IEN) enable condition, the TC1 interrupt request flag will be set

“1” and the system executes the interrupt service routine.

TC1C initial value = xxxx xxxx

0DDH

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TC1C

TC1C7

TC1C6

TC1C5

TC1C4

TC1C3

TC1C2

TC1C1

TC1C0

R/W

TC1 Overflow Time

TC1 rate is determinate by TC1Rate and Code Option TC1_Counter, TC1Rate can set TC1 clock frequency from Fcpu

and TC1_Counter set TC1 became 8-bit, 6-bit, 5-bit or 4-bit counter.

The equation of TC1C initial value is as following.

TC1C initial value = N

- (TC1 interrupt interval time * input clock)

Which N is determinate by code option: TC1_Counter

TC1_Counter

Max. TC1C value

8-bit

256

255

6-bit

5-bit

4-bit

Note: TheTC1C must small or equal than Max. TC1 value.

Example: To set 10ms interval time for TC1 interrupt at Fosc = 3.58MHz

TC1C value (74H) = 256 - (10ms * fcpu/64)

(TC1RATE=010, TC1_Counter=8-bit, TC1X8=0)

TC1C 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 TC1 interrupt at Fosc = 3.58MHz

TC1C value (74H) = 256 - (10ms * fcpu/64)

(TC1RATE=010, TC1_Counter=8-bit, TC1X8=1)

TC1C 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 TC1 interrupt at Fosc = 3.58MHz

TC1C value (32H) = 64 - (1ms * fcpu/64)

(TC1RATE=010, TC1_COunter=6-bit, TC1X8=0)

TC1C 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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