HT85F2270 datasheet(144/226 Pages) HOLTEK

144 / 226 page

Rev. 1.00

144 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

T2CON Register

SFR Address: C8h

Bit

Name

—

I�FR

T�R1

T�R0

T�C�

T�I1

T�I0

R/W

—

R/W

POR

—

Bit 7

Unimplemented, read as “0”

Bit 6

I3FR: Active edge selection for external interrupt “INT3” and PCA module 0

Compare and Capture functions

0: Falling edge

1: Rising edge

This bit is used to select the external interrupt triggered edge for INT3, the PCA Module

0 Compare mode output interrupt triggered edge and the PCA Module 0 Capture mode

input triggered edge. Once the compare mode is enabled, the PCA interrupt will replace

the external interrupt. When Timer 2 is selected as compare mode 0, the I3FR bit is

recommended to be set high by firmware.

Bit 5

I2FR: Active edge selection for external interrupt “INT2”

Described elsewhere

Bit 4~3

T2R1, T2R0: Timer 2 reload mode selection

00: Reload function disabled

01: Reload function disabled

10: Mode 0

11: Mode 1

Bit 2

T2CM: Timer 2 Compare mode selection

0: Mode 0

1: Mode 1

Bit 1~0

T2I1, T2I0: Timer 2 clock source select

00: Timer 2 stopped

01: Internal clock source, decided by the T2PRE1 and T2PRE0 bits in the TMPRE

10: External T2 pin falling edge clock source

11: Internal clock source, decided by the T2PRE1 and T2PRE0 bits, gated by the

external T2 pin

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