SN8F27E64KB datasheet(90/192 Pages) SONIX

90 / 192 page

SN8F27E60 Series

8-Bit Flash Micro-Controller with Embedded ICE and ISP

SONiX TECHNOLOGY CO., LTD

Page 90

Version 1.4

8.2.3 T0M MODE REGISTER

T0M is T0 timer mode control register to configure T0 operating mode including T0 pre-

scaler, clock source…These

configurations must be setup completely before enabling T0 timer.

0B2H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

T0M

T0ENB

T0rate2

T0rate1

T0rate0

T0TB

Read/Write

R/W

After reset

Bit 0

T0TB: RTC clock source control bit.

0 = Disable RTC (T0 clock source from Fcpu).

1 = Enable RTC.

Bit [6:4]

T0RATE[2:0]: T0 timer clock source select bits.

000 = Fcpu/256, 001 = Fcpu/128, 010 = Fcpu/64, 011 = Fcpu/32, 100 = Fcpu/16, 101 = Fcpu/8, 110 =

Fcpu/4,111 = Fcpu/2.

Bit 7

T0ENB: T0 counter control bit.

0 = Disable T0 timer.

1 = Enable T0 timer.



Note: T0RATE is not available in RTC mode. The T0 interval time is fixed at 0.5 sec.

8.2.4 T0C COUNTING REGISTER

T0C is T0 8-bit counter. When T0C overflow occurs, the T0IRQ flag is set as

“1” and cleared by program. The T0C

decides T0 interval time through below equation to calculate a correct value. It is necessary to write the correct value to

T0C register, and then enable T0 timer to make sure the first cycle correct. After one T0 overflow occurs, the T0C

0B3H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

T0C

T0C7

T0C6

T0C5

T0C4

T0C3

T0C2

T0C1

T0C0

Read/Write

R/W

After reset

The equation of T0C initial value is as following.

T0C initial value = 256 - (T0 interrupt interval time * T0 clock rate)



Example: To calculation T0C to obtain 10ms T0 interval time. T0 clock source is Fcpu = 4MHz/4 = 1MHz.

Select T0RATE=001 (Fcpu/128).

T0 interval time = 10ms. T0 clock rate = 4MHz/4/128

T0C initial value = 256 - (T0 interval time * input clock)

= 256 - (10ms * 4MHz / 4 / 128)

= 256 - (10-2 * 4 * 106 / 4 / 128)

= B2H



Note: In RTC mode, T0C is 256 counts and generatesT0 0.5 sec interval time. Don

’t change T0C value in

RTC mode.

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