GMS97C2051 datasheet(7/39 Pages) HYNIX

7 / 39 page

8-Bit CMOS Microcontorller

GMS97C2051/L2051

HYUNDAI MicroElectonics

Figure 3. Time/Counter 0 and 1 Input Clock Logic

Serial

Interface

(USART)

The serial port is full duplex, meaning it can trans-

mit and receive simultaneously. And it can operate

in four modes (one synchronous mode, three asyn-

chronous mode) as illustrated in table 5. The possi-

ble baud rates can be calculated using the formulas

given in table 6.

Table 5. USART Operating Modes

Mode

SCON

Baud Rate

Description

SM0

SM1

fosc / 12

( fixed )

Shift Register

: Serial data enters and exits through RXD.

TXD outputs the shift clock.

Eight data bits are transmitted / received,

with the LSB first.

Set by Timer

( variable )

8-bit UART

: Ten bits are transmitted through TXD, or

received through RXD

a start bit (0), 8 data bits (LSB first),

and a stop bit (1)

fosc / 64 or fosc / 32

( fixed )

9-bit UART

: Eleven bits are transmitted through TXD,

or received through RXD

a start bit (0), 8 data bits (LSB first),

a programmable ninth data bit ,

and a stop bit (1)

Set by Timer

( variable )

9-bit UART

: The same as Mode 2 except the variable

baud rate.

fosc

P3.4/T0

P3.5/T1

max fosc/24

TR 0/1

TCON

Gate

TMOD

fosc/12

Timer 0/1

Input Clock

Control

C/T

TMOD

P3.2/INT0

P3.3/INT1

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