HT85F2240 datasheet(92/147 Pages) HOLTEK

92 / 147 page

Rev. 1.10

9� of 147

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

TBCR Register

SFR Address: B2h

Bit

Name

TBEN

—

TBCK1

TBCK0

—

TBS�

TBS1

TBS0

R/W

—

R/W

—

R/W

POR

—

Bit 7

TBEN: Time Base 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

)

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)

LVD Interrupt

A LVD Interrupt request will take place when the LVD Interrupt request flag, LVDF, is set, which

occurs when the Low Voltage Detector function detects a low power supply voltage. To allow the

program to branch to its respective interrupt vector address, the global interrupt enable bit, EAL,

Low Voltage Interrupt enable bit, ELVD, must first be set. When the interrupt is enabled, the stack

is not full and a low voltage condition occurs, a subroutine call to the Interrupt vector, will take

place. When the Low Voltage Interrupt is serviced, the EAL bit must be cleared by the application

program to disable other interrupts and the LVDF flag will be automatically cleared.

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