M32C8A Datasheet, PDF (68/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
8. Bus
Table 8.3 Processor Mode and Pin Function
Processor Mode
Microprocessor Mode
PM05 and PM04 bits 00b (Multiplexed bus not used)
setting⁽¹⁾
01b (Access CS2 area using multiplexed bus)
10b (Access CS1 area using multiplexed bus)
Data bus width
Access all external Access any external
spaces with 8-bit data spaces with 16-bit
bus
data bus
Access all external Access any external
spaces with 8-bit data spaces with 16-bit
bus
data bus
P0_0 to P0_7
Data bus (D0 to D7)
P1_0 to P1_7
P2_0 to P2_7
I/O port
Data bus
(D8 to D15)
Address bus (A0 to A7)
I/O port
Data bus
(D8 to D15)
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
P4_4 to P4_6
P4_7
P5_0 to P5_2
P5_3
P5_4
Address Bus (A16 to A19)
CS or address bus (A20 to A22) (Refer to 8.2 Bus Control for details)⁽⁶⁾
CS or address bus (A23) (Refer to 8.2 Bus Control for details)⁽⁶⁾
RD, WRL, WRH outputs or RD, BHE, WR outputs (Refer to 8.2 Bus Control for details)⁽⁴⁾
CLKOUT/BCLK/ALE⁽⁷⁾
HLDA/ALE⁽³⁾
P5_5
P5_6
HOLD
ALE⁽³⁾⁽⁵⁾
P5_7
RDY
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.
Rev.1.00 Jul 15, 2007 Page 51 of 352
REJ09B0385-0100