MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(3) Microprocessor mode [10]
Table 9. Relationship between CNVSS pin’s input levels and proces-
The microcomputer enters the microprocessor mode by connecting
the CNVss pin to Vcc and starting from reset. It is possible to enter
this mode by programming the processor mode bits to “10” after con-
necting the CNVss pin to Vss and starting from reset. This mode is
the same as the memory expansion mode except the following: the
internal ROM is disabled and an external memory is required, and
clock φ 1 is always output from port P42 independent of bit 7 of the
processor mode register 0.
sor modes
CNVSS
Mode
• Single-chip
• Memory expansion
• Microprocessor
Description
Single-chip mode upon start-
ing after reset. Each mode
can be selected by changing
the processor mode bits by
software.
VSS
Microprocessor mode upon
starting after reset.
• Microprocessor
VCC
As shown in Table 8, φ 1 output can also be stopped by setting the
signal output disable select bit to “1”. In this case, write “1” to the port
P42 direction register bit.
Table 9 shows the relationship between the CNVss pin’s input level
and the processor modes.
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Additionally, addresses A20 to A22 or chip select signals CS0 to CS4
can be output from port P9 regardless of processor modes. For de-
tails, refer to the following sections: output function of chip select sig-
nal and address output function.
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