GMS97C2051 datasheet(6/39 Pages) HYNIX

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GMS97C2051/L2051

8-Bit CMOS Microcontroller

HYUNDAI MicroElectronics

Table 3. SFR lists and their addresses

Symbol

Name

Address

* ACC

* B

DPH

DPL

* PSW

Accumulator

B Register

Data Pointer High Byte

Data Pointer Low Byte

Program Status Word

Stack Pointer

E0H

F0H

83H

82H

D0H

81H

* IE

* IP

Interrupt Enable Control

Interrupt Priority Control

A8H

B8H

* P1

* P3

Port 1

Port 3

90H

B0H

* SCON

SBUF

Serial Control

Serial Data Buffer

98H

99H

* TCON

TH0

TH1

TL0

TL1

* TMOD

Timer/Counter Control

Timer/Counter 0 High Bytes

Timer/Counter 1 High Bytes

Timer/Counter 0 Low Bytes

Timer/Counter 1 Low Bytes

Timer/Counter Mode Control

88H

8CH

8DH

8AH

8BH

89H

Bit addressable SFR

Timer/Counter 0 and 1

The GMS97C2051/L2051 has two 16-bit Timer/

Counter register : Timer0 and Timer1 . As a Timer,

the register is incremented every machine cycle.

Thus, the register counts machine cycle.

Since a

machine cycle consists of 12 oscillator periods, the

count rate is 1/12 of the oscillator frequency.

As a

counter, the register is incremented in response to a

1-to-0 transition at its corresponding external input

pin P3.4/T0 and P3.5/T1. Since 2 machine cycles

are required to recognize a 1-to-0 transition, the

maximum count rate is 1/24 of the oscillator fre-

quency. External inputs P3.2/INT0 and 3.3/INT1

can be programmed to function as a gate to facili-

tate pulse width measurements. Timer/Counter 0

and 1 can be used in four operating modes as listed

in Table 4. Figure 3 illustrates the input clock

logic.

Table 4. Timer / Counter 0 and 1 Operating Modes

Mode

Description

TMOD

Gate

C / T

8-bit Timer/Counter with 5-bit prescaler

××

16-bit timer/counter

××

8-bit Auto-Reload Timer/Counter

××

(Timer 0) : TL0 is an 8-bit Timer/Counter controlled by

the standard Timer 0 control bits, TH0 is an 8-bit Timer

and is controlled by Timer 1

(Timer 1) : stop

××

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