M30218 Datasheet, PDF (103/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Serial I/O2
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Main address Local address
bus
bus
Serial I/O automatic
transfer RAM
(0040016—004FF16)
Main Local
data bus data bus
Address decoder
Serial I/O2
automatic transfer
data pointer
Serial I/O2
automatic transfer
controller
Serial I/O2
control register 3
XIN
SSTB2
SRDY2•SBUSY2 pin
control bit
SBUSY2
SRDY2•SBUSY2 pin
control bit
SRDY2
Port latch
“0” _{(SSTB2 pin control bit)}
“1”
Port latch
1/4
1/8
1/16
1/32
1/64
1/128
1/256
“0”
“1”
Port latch
“0”
“1”
Serial I/O2
Internal synchronous
synchronous clock ^{clock selection bits}
selection bit _“0
Synchronous
circuit
”
“1”
Serial I/O2 clock
pin selection bit
Port latch
“0”
“1”
Serial transfer
status flag
SCLK21
SCLK22
“0”
“0”
“1”
“1”
“1”
Serial I/O2 clock
“0”
pin selection bits
Serial I/O2 counter
SOUT2
Port latch
“0” _{Port latch}
“1” Serial transfer selection bits
SIN2
Serial I/O2 register (8)
Serial I/O2
interrupt request
Figure GA-1. Block Diagram of Serial I/O2
102