M38747MCT-XXXG View Datasheet(PDF) - MITSUBISHI ELECTRIC

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M38747MCT-XXXG

Single-chip 8-bit CMOS microcomputer. ROM 61440 bytes, RAM 2048 bytes. Mask ROM version.

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3874 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

b7

b0

Serial I/O3 control register 1

(SIO3CON1 (SC31) : address 0014 16)

Serial transfer selection bits

00 : Serial I/O disabled (P82 to P87 pins are I/O ports.)

01 : 8-bit serial I/O

10 : Arbitrary bit serial I/O

11 : Automatic transfer serial I/O (8-bit)

Serial I/O3 synchronous clock selection bits (P8 7/SSTB3 pin control bits)

00 : Internal synchronous clock (P87 pin is I/O port.)

01 : External synchronous clock (P87 pin is I/O port.)

10 : Internal synchronous clock (P87 pin is SSTB3 output.)

11 : Internal synchronous clock (P87 pin is SSTB3 output.)

Serial I/O initialization bit

0 : Serial I/O initialization

1 : Serial I/O enabled

Transfer mode selection bit

0 : Full duplex (transmit/receive) mode (P8 3 pin is SIN3 I/O.)

1 : Transmit-only mode (P83 pin is I/O port.)

Serial I/O3 transfer direction selection bit

0 : LSB First

1 : MSB First

Automatic transfer RAM transmit/receive address selection bit

0 : Transmit/Receive address match 200 16 to 2FF16

(Set automatic transfer data pointer to 00 16 to FF16.)

1 : Transmit address 20016 to 27F16

Receive address 28016 to 2FF16

(Set automatic transfer data pointer to 00 16 to 7F16.)

b7

b0

Serial I/O3 control register 2

(SIO3CON2 (SC32) : address 0015 16)

P85/SRDY3 • P86/SBUSY3 pin control bits

0000: P85, P86 pins are I/O ports.

0001: Unused

0010: P85 pin is SRDY3 output, P86 pin is I/O port.

0011: P85 pin is SRDY3 output, P86 pin is I/O port.

0100: P85 pin is I/O port, P86 pin is SBUSY3 input.

0101: P85 pin is I/O port, P86 pin is SBUSY3 input.

0110: P85 pin is I/O port, P86 pin is SBUSY3 output.

0111: P85 pin is I/O port, P86 pin is SBUSY3 output.

1000: P85 pin is SRDY3 input, P86 pin is SBUSY3 output.

1001: P85 pin is SRDY3 input, P86 pin is SBUSY3 output.

1010: P85 pin is SRDY3 input, P86 pin is SBUSY3 output.

1011: P85 pin is SRDY3 input, P86 pin is SBUSY3 output.

1100: P85 pin is SRDY3 output, P86 pin is SBUSY3 input.

1101: P85 pin is SRDY3 output, P86 pin is SBUSY3 input.

1110: P85 pin is SRDY3 output, P86 pin is SBUSY3 input.

1111: P85 pin is SRDY3 output, P86 pin is SBUSY3 input.

SBUSY3 output • SSTB3 output function selection bit

(valid in automatic transfer mode)

0: Functions as signal for each 1-byte

1: Functions as signal for each transfer data set

Serial transfer status flag

0: Serial transfer complete

1: Serial transfer in-progress

SOUT3 output control bit (when serial data is not transferred)

0: Output active

1: Output high impedance

P82/SOUT3 • P84/SCLK3 P-channel output disable bit

0: CMOS output (in output mode)

1: N-channel open-drain output (in output mode)

Fig. 35 Structure of serial I/O3 control registers 1 and 2

41

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