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M38747MCT-XXXG View Datasheet(PDF) - MITSUBISHI ELECTRIC

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M38747MCT-XXXG Datasheet PDF : 92 Pages
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MITSUBISHI MICROCOMPUTERS
3874 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Serial I/O3
Serial I/O3 has the following modes: 8-bit serial I/O, arbitrary bits
from 1 to 256 serial I/O, up to 256-byte auto-transfer serial I/O.
The 8-bit serial I/O transfers through serial I/O3 register (address
001316). The arbitrary bits and auto-transfer serial I/O modes
transfer through the 256-byte serial I/O3 auto-transfer RAM (ad-
dresses 020016 to 02FF16).
The P85/SRDY3, P86/SBUSY3, and P87/SSTB3 pins all have the
handshake input/output signal function and can perform active
logic high/low selection.
Main
Local
address bus address bus
Serial I/O3 automatic
transfer RAM
(020016 to 02FF16)
Main
Local
data bus data bus
Address decoder
Serial I/O3
automatic transfer
data pointer
Transfer counter
Serial I/O3
automatic transfer
controller
XCIN
Main clock division ratio
selection bits
“10”
Serial I/O3 automatic
transfer interval register
1/4
1/8
XIN
“00,01,11”
P87 latch
1/16
1/32
“00,01” (P87/SSTB3 pin control bits)
1/64
P87/SSTB3
P85/SRDY3
P86/SBUSY3 pin
control bits
P86/SBUSY3
P85/SRDY3
P86/SBUSY3 pin
control bits
P85/SRDY3
“10,11”
P86 latch
“0”
“1”
P85 latch
“0”
1/128
1/256
1/512
Serial I/O3
Serial I/O3 internal
synchronous clock
synchronous clock
selection bits “00,10,11” selection bits
Synchronous
circuit
“01”
“1”
P84/SCLK3
P82/SOUT3
P83/SIN3
P84 latch
“0”
“1” Serial transfer
selection bits
“0”
P83 latch
“1” Serial transfer
selection bits
External clock
Serial transfer
status flag
Serial I/O3 counter
Serial I/O3 register (8)
Serial I/O3
interrupt request
Fig. 34 Block diagram of serial I/O3
40
 

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