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M38B71M1 Datasheet(PDF) 30 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) 30 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
29
Fig. 22 Structure of serial I/O1 control registers 1, 2
b7 b6 b5
b4 b3
b2 b1 b0
b7 b6 b5
b4 b3
b2 b1 b0
PB1/SRDY1 • PB2/SBUSY1 pin control bits
b3b2b1b0
0 0 0 0: Pins PB1 and PB2 are I/O ports
0 0 0 1: Not used
0 0 1 0: PB1 pin is an SRDY1 output, PB2 pin is an I/O port.
0 0 1 1: PB1 pin is an SRDY1 output, PB2 pin is an I/O port.
0 1 0 0: PB1 pin is an I/O port, PB2 pin is an SBUSY1 input.
0 1 0 1: PB1 pin is an I/O port, PB2 pin is an SBUSY1 input.
0 1 1 0: PB1 pin is an I/O port, PB2 pin is an SBUSY1 output.
0 1 1 1: PB1 pin is an I/O port, PB2 pin is an SBUSY1 output.
1 0 0 0: PB1 pin is an SRDY1 input, PB2 pin is an SBUSY1 output.
1 0 0 1: PB1 pin is an SRDY1 input, PB2 pin is an SBUSY1 output.
1 0 1 0: PB1 pin is an SRDY1 input, PB2 pin is an SBUSY1 output.
1 0 1 1: PB1 pin is an SRDY1 input, PB2 pin is an SBUSY1 output.
1 1 0 0: PB1 pin is an SRDY1 output, PB2 pin is an SBUSY1 input.
1 1 0 1: PB1 pin is an SRDY1 output, PB2 pin is an SBUSY1 input.
1 1 1 0: PB1 pin is an SRDY1 output, PB2 pin is an SBUSY1 input.
1 1 1 1: PB1 pin is an SRDY1 output, PB2 pin is an SBUSY1 input.
SBUSY1 output • SSTB1 output function selection bit
(Valid in automatic transfer mode)
0: Functions as each 1-byte signal
1: Functions as signal for all transfer data
Serial transfer status flag
0: Serial transfer completion
1: Serial transferring
SOUT1 pin control bit (at no-transfer serial data)
0: Output active
1: Output high-impedance
PB5/SOUT1 P-channel output disable bit
0: CMOS 3-state (P-channel output is valid.)
1: N-channel open-drain (P-channel output is invalid.)
Serial I/O1 control register 2
(SIO1CON2 (SC12): address 001A16)
Serial I/O1 control register 1
(SIO1CON1 (SC11): address 001916)
Serial transfer selection bits
b1 b0
0 0 : Serial I/O disabled (pins PB0 to PB6 are I/O ports)
0 1 : 8-bit serial I/O
1 0 : Not available
1 1 : Automatic transfer serial I/O (8-bits)
Serial I/O1 synchronous clock selection bits (PB3/SSTB1 pin control bit)
b3 b2
0 0 : Internal synchronous clock (PB3 pin is an I/O port.)
0 1 : External synchronous clock (PB3 pin is an I/O port.)
1 0 : Internal synchronous clock (PB3 pin is an SSTB1 output.)
1 1 : Internal synchronous clock (PB3 pin is an SSTB1 output.)
Serial I/O initialization bit
0: Serial I/O initialization
1: Serial I/O enabled
Transfer mode selection bit
0: Full duplex (transmit and receive) mode (PB6 pin is an SIN1 input.)
1: Transmit-only mode (PB6 pin is an I/O port.)
Transfer direction selection bit
0: LSB first
1: MSB first
Serial I/O1 clock pin selection bit
0:SCLK11 (PB0/SCLK12 pin is an I/O port.)
1:SCLK12 (PB4/SCLK11 pin is an I/O port.)


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