SM89516B datasheet(29/49 Pages) SYNCMOS

29 / 49 page

SM89516B

8-Bit Micro-controller

64KB Flash

& 1KB RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M087

Ver D SM89516B 08/07/2015

- 29 -

Timer 2

Timer2 is a 16-bit timer/counter which can operate as either an event timer or an event counter as selected by C/T2

in the special function register T2CON.

Mnemonic

Description

Dir.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RST

Timer 2

TL2

Timer 2 , low

byte

CCh

TL2[7:0]

00h

TH2

Timer 2 , high

byte

CDh

TH2[7:0]

00h

RCAP2L

Reload and

capture data low

byte

CAh

RCAP2L[7:0]

00h

RCAP2H

Reload and

capture data

high byte

CBh

RCAP2H[7:0]

00h

T2MOD

Timer 2 Mode

C9h

T2OE

DCEN

00h

T2CON

Timer 2 Control

C8h

TF2

EXF2

RCLK

TCLK

EXEN

TR2

CP/

RL2

00h

Mnemonic: T2MOD

Address: 98h

Reset

T2OE

DCEN

00H

T2OE: Timer 2 Output Enable bit. It enables Timer 2 overflow rate to toggle P1.0.

DCEN: Down Count Enable bit. When set, this allows Timer 2 to be configured as an up/down

Counter.

Mnemonic: T2CON

Address: 98h

Reset

TF2

EXF2

RCLK

TCLK

EXEN2

TR2

CP/

RL2

00H

TF2: Timer 2 overflow flag is set by a Timer 2 overflow and must be cleared by software. TF2

will not be set when either RCLK = 1 or TCLK = 1.

EXF2: Timer 2 external flag is 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 will

cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must be cleared by

software. EXF2 does not cause an interrupt in up/down counter mode (DCEN = 1).

RCLK: Receive clock enable. When set, causes the serial port to use Timer 2 overflow pluses

for it’s receive clock in serial port Modes 1 and 3. RCLK = 0 causes Timer 1 overflows to

be used for the receive clock.

TCLK: Transmit clock enable. When set, causes the serial port to use Timer 2 overflow pulses

for it’s transmit clock in serial port Modes 1 and 3. TCLK = 0 causes Timer 1 overflows to

be used for the transmit clock.

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