M16C30_02 Datasheet, PDF (26/178 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Bus Settings
Mitsubishi microcomputers
M16C / 30 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.8.2. Pin functions for each processor mode
Processor mode
Single-chip
mode
Memory expansion mode/microprocessor modes
Multiplexed bus
space select bit
“01”, “10”
Either CS1 or CS2 is for
multiplexed bus and others
are for separate bus
“00”
(separate bus)
Data bus width
BYTE pin level
P00 to P07
I/O port
8 bits
“H”
Data bus
16 bits
“L”
Data bus
8 bits
“H”
Data bus
16 bits
“L”
Data bus
Memory
expansion mode
“11” (Note 1)
multiplexed
bus for the
entire
space
8 bit
“H”
I/O port
P10 to P17
I/O port
I/O port
Data bus
I/O port
Data bus
I/O port
P20
P21 to P27
P30
P31 to P37
I/O port
I/O port
I/O port
I/O port
Address bus
Address bus
/data bus(Note 2)
Address bus
Address bus
Address bus
Address bus
/data bus(Note 2) /data bus(Note 2)
Address bus
Address bus Address bus
/data bus(Note 2)
Address bus Address bus Address bus
Address bus
Address bus
Address bus
Address bus
Address bus
/data bus
Address bus
/data bus
A8/D7
I/O port
P40 to P43
Port P40 to P43
function select bit = 1
P40 to P43
Port P40 to P43
function select bit = 0
P44 to P47
I/O port
I/O port
I/O port
P50 to P53
I/O port
P54
I/O port
I/O port
I/O port
I/O port
I/O port
I/O port
Address bus Address bus Address bus Address bus I/O port
CS (chip select) or programmable I/O port
(For details, refer to “Bus control”)
Outputs RD, WRL, WRH, and BCLK or RD, BHE, WR, and BCLK
(For details, refer to “Bus control”)
HLDA
HLDA
HLDA
HLDA
HLDA
P55
I/O port
HOLD
HOLD
HOLD
HOLD
HOLD
P56
I/O port
ALE
ALE
ALE
ALE
ALE
P57
I/O port
RDY
RDY
RDY
RDY
RDY
Note 1: If the entire space is of multiplexed bus in memory expansion mode, choose an 8-bit width.
The processor operates using the separate bus after reset is revoked, so the entire space multiplexed bus cannot be
chosen in microprocessor mode.
P31 to P37 become a port if the entire space multiplexed bus is chosen, so only 256 bytes can be used
in each chip select.
Note 2: Address bus when in separate bus mode.
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