M32CSLASH8A datasheet(68/372 Pages) RENESAS

68 / 372 page

M32C/8A Group

8. Bus

Rev.1.00

Jul 15, 2007

Page 51 of 352

REJ09B0385-0100

Table 8.3

Processor Mode and Pin Function

NOTES:

1. Do not set bits PM05 and PM04 in the PM0 register to 11b in microprocessor mode since the MCU starts up

with the separate bus after reset.

2. These pins are used as address bus when selecting separate bus.

3. Bits PM15 and PM14 in the PM1 register determine which pin is used to output the ALE signal.

4. The PM02 bit in the PM0 register selects either “RD, WRL, WRH” or “RD, BHE, WR” combination.

5. P5_6 outputs undefined value when bits PM15 and PM14 are set to 00b (no ALE). In this case, it cannot be

used as an I/O port.

6. Bits PM11 and PM10 in the PM1 register determine whether these pins are used as chip-select outputs or

address bus.

7. Use bits CM01 and CM00 in the CM0 register, bits PM15 and PM14 in the PM1 register, and the PM07 bit in

the PM0 register to select among CLKOUT, BCLK, and ALE function.

Processor Mode

Microprocessor Mode

PM05 and PM04 bits

setting(1)

00b (Multiplexed bus not used)

01b (Access CS2 area using multiplexed bus)

10b (Access CS1 area using multiplexed bus)

Data bus width

Access all external

spaces with 8-bit data

bus

Access any external

spaces with 16-bit

data bus

Access all external

spaces with 8-bit data

bus

Access any external

spaces with 16-bit

data bus

P0_0 to P0_7

Data bus (D0 to D7)

P1_0 to P1_7

I/O port

Data bus

(D8 to D15)

I/O port

Data bus

(D8 to D15)

P2_0 to P2_7

Address bus (A0 to A7)

Address bus/data bus (A0/D0 to A7/D7)(2)

P3_0 to P3_7

Address bus (A8 to A15)

Address bus/data bus

(A8/D8 to A15/D15)(2)

P4_0 to P4_3

Address Bus (A16 to A19)

P4_4 to P4_6

CS or address bus (A20 to A22) (Refer to 8.2 Bus Control for details)(6)

P4_7

CS or address bus (A23) (Refer to 8.2 Bus Control for details)(6)

P5_0 to P5_2

RD, WRL, WRH outputs or RD, BHE, WR outputs (Refer to 8.2 Bus Control for details)(4)

P5_3

CLKOUT/BCLK/ALE(7)

P5_4

HLDA/ALE(3)

P5_5

HOLD

P5_6

ALE(3)(5)

P5_7

RDY

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