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M38B71M1 Datasheet(PDF) 29 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 29 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
28
SERIAL I/O
Serial I/O1
Serial I/O1 is used as the clock synchronous serial I/O and has an
ordinary mode and an automatic transfer mode. In the automatic
transfer mode, serial transfer is performed through the serial I/O
automatic transfer RAM which has up to 256 bytes (addresses
Fig. 21 Block diagram of serial I/O1
0F0016 to 0FFF16).
The PB1/SRDY1, PB2/SBUSY1, and PB3/SSTB1 pins each have a
handshake I/O signal function and can select either “H” active or
“L” active for active logic.
Main
data bus
Serial I/O1
automatic transfer
controller
Local
data bus
Serial I/O automatic
transfer RAM
(0F0016 to 0FFF16)
Serial I/O1
control register 3
XCIN
XIN
Internal system
clock selection bit
Serial I/O1
automatic transfer
data pointer
Address decoder
Main address
bus
Local address
bus
“1”
“0”
1/8
1/16
1/32
1/64
1/128
Serial I/O1
interrupt request
PB2 latch
Serial I/O1 counter
Synchronous
circuit
Serial I/O1
synchronous clock
selection bit
“1”
PB1 latch
PB4/SCLK11
“0”
“1”
“0”
Internal synchronous
clock selection bits
1/256
PB3 latch
PB2/SBUSY1
PB3/SSTB1
(PB3/SSTB1 pin control bit)
Serial transfer
status flag
“0”
“1”
“0”
“1”
PB1/SRDY1
“0”
“1”
PB4 latch
PB5/SOUT1
PB6/SIN1
PB5 latch
Serial I/O1 register (8)
“0”
“1” Serial transfer selection bits
1/2
1/4
Serial I/O1 clock
pin selection bit
PB0/SCLK12
“1”
“0”
PB0 latch
“0”
“1”
“0”“1”
Serial I/O1 clock
pin selection bits
PB1/SRDY1•PB2/SBUSY1
pin control bit
PB1/SRDY1•PB2/SBUSY1
pin control bit


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