Processor Mode; Types Of Processor Mode; Setting Processor Modes - Renesas M16C/60 Series Hardware Manual

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M16C/6N5 Group

Processor Mode

(1) Types of Processor Mode

Three processor modes are available to choose from: single-chip mode, memory expansion mode, and
microprocessor mode. Table 1.6.1 shows the features of these processor modes.
Table 1.6.1 Features of Processor Modes
Processor mode
Single-chip mode
Memory expansion mode
Microprocessor mode
Note: Refer to "Bus".

(2) Setting Processor Modes

Processor mode is set by using the CNV
Table 1.6.2 shows the processor mode after hardware reset. Table 1.6.3 shows the PM01 to PM00 bits
set values and processor modes.
Table 1.6.2 Processor Mode After Hardware Reset
CNV pin input level
SS
V
SS
V (Notes 1, 2)
CC1
Note 1: If the microcomputer is reset in hardware by applying V
be accessed regardless of PM01 to PM00 bits.
Note 2: The multiplexed bus cannot be assigned to the entire CS space.
Table 1.6.3 PM01 to PM00 Bits Set Values and Processor Modes
PM01 to PM 00 bits
00
2
01
2
10
2
11
2
Rewriting the PM01 to PM00 bits places the microcomputer in the corresponding processor mode regardless
of whether the input level on the CNV
cannot be rewritten to "01
the PM07 to PM02 bits are rewritten. Note also that these bits cannot be rewritten to enter microprocessor
mode in the internal ROM, nor can they be rewritten to exit microprocessor mode in areas overlapping the
internal ROM.
If the microcomputer is reset in hardware by applying V
ROM cannot be accessed regardless of PM01 to PM00 bits.
Figures 1.6.1 and 1.6.2 show the processor mode related registers. Figure 1.6.3 shows the memory map
in single-chip mode. Figures 1.6.4 and 1.6.5 show the memory map and CS area in memory expansion
mode and microprocessor mode.
Rev.1.00 2003.05.30 page 26
Access space
SFR, internal RAM, internal ROM
SFR, internal RAM, internal ROM,
external area (Note)
SFR, internal RAM, external area (Note) Some pins serve as bus control pins (Note)
pin and the PM01 to PM00 bits in the PM0 register.
SS
Single-chip mode
Microprocessor mode
Single-chip mode
Memory expansion mode
Must not be set
Microprocessor mode
pin is "H" or "L". Note, however, that the PM01 to PM00 bits
SS
" (memory expansion mode) or "11
2
Pins which are assigned I/O ports
All pins are I/O ports or
peripheral function I/O pins
Some pins serve as bus control pins (Note)
Processor mode
to the CNV pin, the internal ROM cannot
CC1 SS
_____
Processor mode
" (microprocessor mode) at the same time
2
to the CNV pin (hardware reset), the internal
CC1 SS
_____
Processor Mode