Renesas M16C/6NK Información técnica Pagina 63

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Rev.2.10 Apr 14, 2006 page 39 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 6. Processor Mode
6.2 Setting Processor Modes
Processor mode is set by using the CNVSS pin and bits PM01 to PM00 in the PM0 register.
Table 6.2 shows the Processor Mode after Hardware Reset. Table 6.3 shows the PM01 to PM00 bits set
values and processor modes.
Table 6.2 Processor Mode after Hardware Reset
CNVSS Pin Input Level Processor Mode
VSS Single-chip mode
VCC
(1) (2) (3)
Microprocessor mode
PM01 to PM 00 Bits Processor Mode
00b Single-chip mode
01b
(1)
Memory expansion mode
10b Do not set a value
11b
(1)
Microprocessor mode
NOTES:
1. If the microcomputer is reset in hardware by applying VCC to the CNVSS pin, the internal ROM
cannot be accessed regardless of PM01 to PM00 bits.
2.
_____
The multiplexed bus cannot be assigned to the entire CS space.
3. Not available in T/V-ver.. Do not set a value.
Table 6.3 PM01 to PM00 Bits Set Values and Processor Modes
NOTE:
1. Not available in T/V-ver.. Do not set a value.
Rewriting bits PM01 to PM00 places the MCU in the corresponding processor mode regardless of whether
the input level on the CNVSS pin is H or L. Note, however, that bits PM01 to PM00 cannot be rewritten
to 01b (memory expansion mode) or 11b (microprocessor mode)
(1)
at the same time bits PM07 to PM02 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.
NOTE:
1. Not available memory expansion and mocroprocessor modes in T/V-ver..
If the MCU is reset in hardware by applying VCC to the CNVSS pin (hardware reset), the internal ROM
cannot be accessed regardless of bits PM01 to PM00.
Figures 6.1 and 6.2 show the PM0 Register and PM1 Registger. Figure 6.3 shows the Memory Map in
_____
Single-chip Mode. Figures 6.4 to 6.7 show the Memory Map and CS Area in Memory Expansion Mode and
Microprocessor Mode (Normal-ver. only).
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