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7. Processor Mode
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5
8
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C
2
3
M
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2
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5
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C
2
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M
0 0 : Multiplexed bus is not used
0 1 : Access the CS2 area using the bus
0 1 : Access the CS1 area using the bus
1 1 : Access all CS areas using the bus(5)
NOTES:
1. Rewrite the PM0 register after the PRC1 bit in the PRCR register is set to "1"(write enable).
2. The PM01 and PM00 bits maintain values set before reset, even after software reset or watchdog
timer reset has performed.
3. Set the PM01 and PM00 bits to "012" or "112" separately. Rewrite other bits before rewriting the
PM01 and PM00 bits.
4. The PM04 and PM05 bits are available in memory expansion mode or microprocessor mode.
Set the PM05 and PM04 bits to "002" in mode 0.
Do not set the PM05 and PM04 bits to "012" in mode 2.
5. The PM05 and PM04 bits cannot be set to "112" in microprocessor mode since the microcomputer
starts up with the separate bus after reset.
When the PM05 and PM04 bits are set to "112" in memory expansion mode, the microcomputer can
access each 64-Kbyte chip-select-assigned address space. The multiplexed bus is not available in
mode 0. The microcomputer accesses the CS0 to CS2 in mode 1, CS0 and CS1 in mode 2 and
CS0 to CS3 in mode 3.
6. No BCLK is output in single-chip mode even if the PM07 bit is set to "0". When a clock output is
terminated in microprocessor mode or memory expansion mode, set the PM07 bit to "1" and the
CM01 and CM00 bits in the CM0 register to "002" (I/O port P53). P53 outputs "L".
7. When the PM07 bit is set to "0" (BCLK output), set the CM01 and CM00 bits to "002".
8. M32C/85T cannot be used in memory expansion mode and microprocessor mode.
Symbol
Address
After Reset
PM0
000416
1000 00002 (CNVss = "L")
0000 00112 (CNVss = "H")
Processor Mode Register 0(1)
RW
b1 b0
b5 b4
0: RD / BHE / WR
1: RD / WRH / WRL
PM00
PM01
PM02
PM03
Software Reset Bit
R/W Mode Select Bit
PM04
PM05
(b6)
0 0: Single-chip mode
0 1: Memory expansion mode(8)
1 0: Do not set to this value
1 1: Microprocessor mode(8)
Set to "0"
PM07
BCLK Output
Disable Bit(6)
Reserved Bit
0 : BCLK is output(7)
1 : BCLK is not output
The CM01 and CM00 bits in the
CM0 register determine pin functions
The microcomputer is reset when
this bit is set to "1". When read, its
content is "0".
Bit Name
Function
Bit
Symbol
Processor Mode Bit(2, 3)
Multiplexed Bus Space
Select Bit(4)
b7
b6
b5
b4
b3
b2
b1
b0
0
Figure 7.1 PM0 Register