IS89C52 View Datasheet(PDF) - Integrated Silicon Solution

Part Name

Description

Manufacturer

IS89C52

CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH

Integrated Silicon Solution 

IS89C52

ISSI ®

T2CON:

Timer/Counter 2 Control Register. Bit Addressable.

765

4

3

21

0

TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2

Register Description:

TF2 T2CON.7 Timer 2 overflow flag set by hardware

and cleared by software. TF2 cannot

be set when either RCLK = 1 or

TCLK = 1.

EXF2 T2CON.6 Timer 2 external flag set when either a

capture or reload is caused by a

negative transition on T2EX, and

EXEN2 = 1. When Timer 2 interrupt is

enabled, EXF2 = 1 causes the CPU to

vector to the Timer 2 interrupt routine.

EXF2 must be cleared by software.

RCLK T2CON.5 Receive clock flag. When set, causes

the Serial Port to use Timer 2 overflow

pulses for its receive clock in modes 1

and 3. RCLK = 0 causes Timer 1

overflow to be used for the receive

clock.

TLCK T2CON.4 Transmit clock flag. When set, causes

the Serial Port to use Timer 2 overflow

pulses for its transmit clock in modes 1

and 3. TCLK = 0 causes Timer 1

overflows to be used for the transmit

clock.

EXEN2

T2CON.3 Timer 2 external enable flag.

When set, allows a capture or reload to

occur as a result of negative transition

on T2EX if Timer 2 is not being used to

clock the Serial Port, EXEN2 = 0 causes

Timer 2 to ignore events at T2EX.

TR2 T2CON.2 Software START/STOP control for

Timer 2. A logic 1 starts the Timer.

C/T2 T2CON.1 Timer or Counter select.

0 = Internal Timer. 1 = External Event

Counter (triggered by falling edge).

CP/RL2

T2CON.0 Capture/Reload flag.

When set, captures occur on negative

transitions at T2EX if EXEN2 = 1. When

cleared, auto-reloads occur either with

Timer 2 overflows or negative

transitions at T2EX when EXEN2 = 1.

When either RCLK = 1 or TCLK = 1,

this bit is ignored and the Timer is

forced to auto-reload on Timer 2

overflow.

Note:

1. Timer 2 Operating Modes

RCLK + TCLK CP/RL2 TR2 MODE

0

0

1 16-Bit Auto-Reload

0

1

1 16-Bit Capture

1

X

1 Baud Rate Generator

X

X

0 (Off)

14

Integrated Silicon Solution, Inc. — 1-800-379-4774

MC013-1C

11/21/98

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