M16CSLASH62M datasheet(540/615 Pages) RENESAS

540 / 615 page

External Buses

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-223

4.2 Data Access

4.2.1 Data Bus Width

If the voltage level input to the BYTE pin is “H”, the external data bus width becomes 8 bits, and P10 (/

D8) through P17 (/D15) can be used as I/O ports (Figure 4.2.1).

If the voltage level input to the BYTE pin is “L”, the external data bus width becomes 16 bits, and P10

(/D8) through P17 (/D15) operate as a data bus (D8 through D15) (Figure 4.2.1).

Figure 4.2.1. Level of BYTE pin and external data bus width

Chip select CS0 to CS3 (Note 2)

RD, WRL, WRH / RD, BHE, WR (Note 3)

BCLK, HLDA, HOLD, ALE, RDY

Bus width : 8-bit (BYTE = “H”)

Microcomputer

P00 to P07

External device

P10 to P17

P20 to P27

P30 to P37

P40 to P43

P44 to P47

P50 to P52

P53 to P57

Bus width : 16-bit (BYTE = “L”)

Data bus D0 to D7

I/O port

Address bus A0 to A15

Address bus A16 to A19 (Note 1)

BCLK, HLDA, HOLD, ALE, RDY

Microcomputer

P00 to P07

External device

P10 to P17

P20 to P27

P30 to P37

P40 to P43

P44 to P47

P50 to P52

P53 to P57

Note 1: Can be switched to I/O port using the port P40 to P43 function select bits of processor mode register 0 (address 000416).

Note 2: When reset, only CS0 outputs a chip select signal. CS1 through CS3 become input ports.

I/O ports can be switched using the CSi output enable bit of the chip select control register (address 000816).

Note 3: The feature can be switched using the R/W mode select bit of processor mode register 0 (address 000416).

Data bus D0 to D7

Data bus D8 to D15

Address bus A0 to A15

Address bus A16 to A19 (Note 1)

RD, WRL, WRH / RD, BHE, WR (Note 3)

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