GMS97C2051 datasheet(8/39 Pages) HYNIX

8 / 39 page

GMS97C2051/L2051

8-Bit CMOS Microcontroller

HYUNDAI MicroElectronics

Table 6. Formulas for calculating Baud rates

Baud Rate

generated from

Serial Port Mode

Baud Rate

Oscillator

fosc / 12

SMOD x fosc) / 64

Timer1

(Timer1 Mode2)

1 , 3

SMOD x Timer1 overflow rate) / 32

SMOD x fosc) / [32 x 12 x (256-TH1)]

Interrupt

System

The GMS97C2051/L2051 provides 5 interrupt

sources ( two external interrupts, two timer inter-

rupts and serial port interrupt ) with two priority

levels.

Figure 4 gives a general overview of the

interrupt sources and illustrates the request and

control flags.

A low-priority interrupt can itself be interrupted by

a high-priority interrupt, but not by another low

priority interrupt.

A high-priority interrupt cannot

be interrupted by any other interrupt source.

If two requests of different priority levels are re-

ceived simultaneously,

the request of higher

priority is serviced.

If requests of the same prior-

ity level are received simultaneously, an internal

polling sequence determines which request is serv-

iced.

Thus within each priority level there is a

second priority structure determined by the polling

sequence like Table 8.

Figure 4. Interrupt Request Sources

Timer 1 Overflow

ET1

IE.3

PT1

IP.3

TF1

TCON.7

IT0

TCON.0

TCON.1

IE0

EX0

IE.0

PX0

IP.0

P3.2/

INT0

IE.7

IT1

TCON.2

TCON.3

IE1

EX1

IE.2

PX1

IP.2

P3.3/

INT1

TF0

TCON.5

Timer 0 Overflow

ET0

IE.1

PT0

IP.1

SCON.0

USART

SCON.1

IE.4

IP.4

High Priority

Low Priority

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