Serial Input/Output (Sio) - Abov MC80F0304 User Manual

MC80F0304/08/16

15. SERIAL INPUT/OUTPUT (SIO)

The serial Input/Output is used to transmit/receive 8-bit data se- control circuit as illustrated in Figure 15-1 . The SO pin is de-
rially. The Serial Input/Output (SIO) module is a serial interface signed to input and output. So the Serial I/O(SIO) can be operated
useful for communicating with other peripheral of microcontrol- with minimum two pin. Pin R00/SCK, R01/SI, and R02/SO pins
ler devices. These peripheral devices may be serial EEPROMs, shift registers, display drivers, A/D converters, etc. This SIO is 8- 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.
bit clock synchronous type and consists of serial I/O data register, The data in the Serial Data Register can be shifted synchronously
serial I/O mode register, clock selection circuit, octal counter and with the transfer clock signal.
SIOST SIOSF
SCK[1:0] clear
POL Start
X PIN ÷ 4 00 SIO Complete overflow
IN ÷ 16 01 "0" Clock CONTROL
Timer0 Overflow 10 "1" CIRCUIT Clock Octal SIOIF
11 (3-bit) Counter
SCK PIN "11" MUX Interrupt Serial communication
not "11"
SCK[1:0]
SM0 IOSW
SOUT
SO PIN
IOSW
1 Input shift register
SI PIN 0
Shift
SIOR
Internal Bus
Figure 15-1 SIO Block Diagram
November 4, 2011 Ver 2.12 81