MC80F0804D View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

Unspecified 

MC80F0704/0708/0804/0808

15. SERIAL INPUT/OUTPUT (SIO)

The serial Input/Output is used to transmit/receive 8-bit data se-

rially. The Serial Input/Output (SIO) module is a serial interface

useful for communicating with other peripheral of microcontrol-

ler devices. These peripheral devices may be serial EEPROMs,

shift registers, display drivers, A/D converters, etc. This SIO is 8-

bit clock synchronous type and consists of serial I/O data register,

serial I/O mode register, clock selection circuit, octal counter and

control circuit as illustrated in Figure 15-1 . The SO pin is de-

signed to input and output. So the Serial I/O(SIO) can be operated

with minimum two pin. Pin R00/SCK, R01/SI, and R02/SO pins

are controlled by the Serial Mode Register. The contents of the

Serial I/O data register can be written into or read out by software.

The data in the Serial Data Register can be shifted synchronously

with the transfer clock signal.

XIN PIN

Timer0

Overflow

SCK PIN

SO PIN

SIOST

SIOSF

SCK[1:0]

÷4

00

÷ 16

01

10

11

“11” MUX

not “11”

SCK[1:0]

SM0

POL

“0”

“1”

IOSW

Start

Complete

SIO

Clock CONTROL

CIRCUIT

Clock

SOUT

clear

overflow

Octal

Counter

(3-bit)

SIOIF

Serial communication

Interrupt

IOSW

1

SI PIN

0

Input shift register

Shift

SIOR

Internal Bus

Figure 15-1 SIO Block Diagram

October 31, 2011 Ver 1.03

73

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