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38B7 Datasheet(PDF) 29 Page - Renesas Technology Corp |
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38B7 Datasheet(HTML) 29 Page - Renesas Technology Corp |
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29 / 110 page ![]() 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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