SN8F27E64KB datasheet(89/192 Pages) SONIX

89 / 192 page

SN8F27E60 Series

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

SONiX TECHNOLOGY CO., LTD

Page 89

Version 1.4

8.2.2 T0 Timer Operation

T0 timer is controlled by T0ENB bit. When T0ENB=0, T0 timer stops. When T0ENB=1, T0 timer starts to count. T0C

increases

“1” by timer clock source. When T0 overflow event occurs, T0IRQ flag is set as ”1” to indicate overflow and

cleared by program. The overflow condition is T0C count from full scale (0xFF) to zero scale (0x00). T0 doesn

’t build in

double buffer, so load T0C by program when T0 timer overflows to fix the correct interval time. If T0 timer interrupt

function is enabled (T0IEN=1), the system will execute interrupt procedure. The interrupt procedure is system program

counter points to interrupt vector (ORG 000BH) and executes interrupt service routine after T0 overflow occurrence.

Clear T0IRQ by program is necessary in interrupt procedure. T0 timer can works in normal mode, slow mode and

green mode. In green mode, T0 keeps counting, set T0IRQ and wakes up system when T0 timer overflows.

0x00 or “n”

by program

...

Clock

Source

T0C

T0IRQ

T0 timer overflows. T0IRQ set as “1”.

Reload T0C by program.

T0IRQ is cleared by program.

0x01

or n+1

0xFE

0xFF

...

0x00 or “n”

by program

0x02

or n+2

0x02

or n+2

T0 clock source is Fcpu (instruction cycle) through T0rate[2:0] pre-scalar to decide Fcpu/2~Fcpu/256. T0 length is 8-bit

(256 steps), and the one count period is each cycle of input clock.

T0rate[2:0]

T0 Clock

T0 Interval Time

Fhosc=16MHz,

Fcpu=Fhosc/4

Fhosc=4MHz,

Fcpu=Fhosc/4

IHRC_RTC mode

max. (ms) Unit (us) max. (ms) Unit (us)

max.

(sec)

Unit (ms)

000b

Fcpu/256

16.384

65.536

256

001b

Fcpu/128

8.192

32.768

128

010b

Fcpu/64

4.096

16.384

011b

Fcpu/32

2.048

8.192

100b

Fcpu/16

1.024

4.096

101b

Fcpu/8

0.512

2.048

110b

Fcpu/4

0.256

1.024

111b

Fcpu/2

0.128

0.5

0.512

32768Hz/64

0.5

1.953

SN8F27E64KB Datasheet(PDF) 89 Page - SONiX Technology Company

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