7643_06 Datasheet, PDF (45/424 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

7643 Group
OVERVIEW
FUNCTIONAL DESCRIPTION
φ
P80/SRDY
P81/SCLK
P83/STXD
P82/SRXD
1/2
Data bus
1/4
1/8
1/16
1/32
Synchronous
clock select bit
“0”
P80 latch
Synchronization
“1”
circuit
SRDY output select bit
1/64
1/128
“1”
1/256
Internal synchronous
“0”
clock selection bits
External clock
“0”
P81 latch
“1”
Serial I/O port select bit
“0”
P83 latch
“1” Serial I/O port select bit
“1”
“0” _{SRXD input enable bit}
Serial I/O counter (3)
SPI mode select bit
Serial I/O shift register (8)
Serial I/O
interrupt request
Fig. 22 Block diagram of serial I/O
Rev.2.00 Aug 28, 2006 page 28 of 103
REJ09B0133-0200