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M16C/64C Group
10.3
Operations
10.3.1
Processor Mode Settings
Set the processor mode using the CNVSS pin and bits PM01 to PM00 in the PM0 register.
In hardware reset, power-on reset, or voltage monitor 0 reset, the processor mode is selected by the
CNVSS pin input level. Table 10.8 lists Processor Mode after Hardware Reset, Power-On Reset, or
Voltage Monitor 0 Reset.
Table 10.8
Processor Mode after Hardware Reset, Power-On Reset, or Voltage Monitor 0 Reset
CNVSS Pin Input Level
VSS
VCC1
Rewriting bits PM01 to PM00 places the MCU in the mode corresponding to bits PM01 to PM00
regardless of whether the input level of the CNVSS pin is high or low. When VCC1 is applied to the
CNVSS pin and then the MCU is reset by hardware reset, power-on reset, or voltage monitor 0 reset,
the internal ROM cannot be accessed regardless of the value of bits PM01 to PM00. Table 10.9 lists
Bits PM01 to PM00 Set Values and Processor Modes.
Do not rewrite these bits to enter microprocessor mode in the internal ROM, or to exit microprocessor
mode in areas overlapping the internal ROM.
Table 10.9
Bits PM01 to PM00 Set Values and Processor Modes
Bits PM01 to PM00
00b
01b
10b
11b
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
Processor Mode
Single-chip mode
Microprocessor mode
Processor Mode
Single-chip mode
Memory expansion mode
Do not set this value.
Microprocessor mode
Bits PM01 to PM00 in the PM0 Register
00b (single-chip mode)
11b (microprocessor mode)
10. Processor Mode
Page 136 of 807
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