HT66F016 datasheet(91/116 Pages) HOLTEK

91 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

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

TB02

TB01

TB00

R/W

POR

0011

111

Bit 7

TBON: Time Base control

0: disable

1: enable

Bit 6

TBCK: Time Base clock fTB selection

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

Unimplemented, read as 0

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

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

T B C K B i t

T B 0 2 ~ T B 0 0

f T B

f T B C = f L I R C

Time Base Interrupt

HT66F016 Datasheet(PDF) 91 Page - Holtek Semiconductor Inc

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