HT68F20 datasheet(160/210 Pages) HOLTEK

160 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev. 1.00

160

November 3, 2009

The purpose of the Time Base Interrupt is to provide an interrupt signal at fixed time periods. Their clock sources origi-

nate from the internal clock source fTB. This fTB input clock passes through a divider, the division ratio of which is se-

lected by programming the appropriate bits in the TBC register to obtain longer interrupt periods whose value ranges.

The clock source that generates fTB, which in turn controls the Time Base interrupt period, can originate from several

different sources, as shown in the System Operating Mode section.

· TBC Register

Bit

76543210

Name

TBON

TBCK

TB11

TB10

LXTLP

TB02

TB01

TB00

R/W

POR

00110111

Bit 7

TBON: TB0 and TB1 Control

0: Disable

1: Enable

Bit 6

TBCK: Select fTB Clock

0: fTBC

1: fSYS/4

Bit 5~4

TB11~TB10: Select Time Base 1 Time-out Period

00: 4096/fTB

01: 8192/fTB

10: 16384/fTB

11: 32768/fTB

Bit 3

LXTLP: LXT Low Power Control

0: Disable

1: Enable

Bit 2~0

TB02~TB00: Select Time Base 0 Time-out Period

000: 256/fTB

001: 512/fTB

010: 1024/fTB

011: 2048/fTB

100: 4096/fTB

101: 8192/fTB

110: 16384/fTB

111: 32768/fTB

L X T

L I R C

f S Y S / 4

¸ 2 ~ 2

1 5

¸ 2 ~ 2

1 2

1 5

T B 1 1 ~ T B 1 0

T i m e B a s e 0 I n t e r r u p t

T i m e B a s e 1 I n t e r r u p t

C o n f i g u r a t i o n

O p t i o n

T B C K B i t

T B 0 2 ~ T B 0 0

f T B

f T B C

Time Base Interrupt

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