HT45F43 datasheet(121/152 Pages) HOLTEK

121 / 152 page

Time Base Interrupt

The function of the Time Base Interrupts is to provide regular time signal in the form of an internal

interrupt. They are controlled by the overflow signals from their respective timer functions. When these

happens their respective interrupt request flags, TB0F or TB1F will be set. To allow the program to

branch to their respective interrupt vector addresses, the global interrupt enable bit, EMI and Time Base

enable bits, TB0E or TB1E, must first be set. When the interrupt is enabled, the stack is not full and the

Time Base overflows, a subroutine call to their respective vector locations will take place. When the

interrupt is serviced, the respective interrupt request flag, TB0F or TB1F, will be automatically reset and

the EMI bit will be cleared to disable other interrupts.

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

clock sources originate from the internal clock source fTB. This fTB input clock passes through a divider,

the division ratio of which is selected 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 f

TB Clock

0: f

TBC

1: f

SYS/4

Bit 5~4

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

00: 4096/f

01: 8192/f

10: 16384/f

11: 32768/f

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/f

001: 512/f

010: 1024/f

011: 2048/f

100: 4096/f

101: 8192/f

110: 16384/f

111: 32768/f

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

121

September 15, 2011

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

T o B u z z e r

Time Base Interrupt

HT45F43 Datasheet(PDF) 121 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 121 Page - Holtek Semiconductor Inc

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