HT85F2270 datasheet(115/226 Pages) HOLTEK

115 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

TBCR Register

SFR Address: B2h

Bit

Name

TBEN

—

TBCK1

TBCK0

—

TBS�

TBS1

TBS0

R/W

—

R/W

—

R/W

POR

—

Bit 7

TBEN: TB Control bit

0: Disable

1: Enable

Bit 6

Unimplemented, read as “0”

Bit 5~4

TBCK1~TBCK0: Select Time Base clock source, fTBC

00: fSYS/4

01: fSYS/128

1x: f32K (f32K is sourced from fLIRC or fLXT)

Bit 3

Unimplemented, read as “0”

Bit 2~0

TBS2~TBS0: Select Time Base Time-out Period

000: 256/fTBC

001: 512/fTBC

010: 1024/fTBC

011: 2048/fTBC

100: 4096/fTBC

101: 8192/fTBC

110: 16384/fTBC

111: 32768/fTBC (default setting)

I2C Interface Interrupt

An I2C Interrupt request will take place when the I2C Interrupt request flag, SI, is set, which occurs

when one of the 25 possible I2C states takes place. To allow the program to branch to its respective

interrupt vector address, the global interrupt enable bit, EAL, and the I2C Interface Interrupt enable

bit, EI2C, must first be set. When the interrupt is enabled, the stack is not full and a byte of data

has been compared match with the I2C states, a subroutine call to the respective Interrupt vector,

will take place. When the I2C Interface Interrupt is serviced, the EAL bit must be cleared by the

application program to disable other interrupts, and the SI flag also must be cleared using the

application program.

HT85F2270 Datasheet(PDF) 115 Page - Holtek Semiconductor Inc

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