Renesas M16C/64A Series User Manual page 167

M16C/64A Group
PM13 (Internal area expansion bit 0) (b3)
This bit is used to select the range of the RAM, program ROM 1, and external area.
When the PM13 bit is 0, the size of the RAM and program ROM 1 is limited, but a wide range can be
selected for the external area.
When the PM13 bit is 1, the entire RAM and addresses 80000h to CFFFFh in program ROM 1 are
available. Table 10.5 lists the Functions of PM13 Bit and Table 10.6 lists Functions of Addresses
80000h to CFFFFh.
Table 10.5 Functions of PM13 Bit
Access Area
Internal RAM
Program ROM 1
External Memory
expansion
mode
Micro-
processor
mode
PM13: Bit in the PM1 register
Table 10.6 Functions of Addresses 80000h to CFFFFh
PM13 Bit in PM1 Register
Single-chip mode
Memory expansion
Processor Mode
mode
Microprocessor mode
The PM13 bit becomes 1 while the FMR01 bit in the FMR0 register is set to 1 (CPU rewrite mode).
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
PM13 = 0
Addresses 00400h up to
03FFFh (15 KB) are available
(addresses 04000h to 0CFFFh
cannot be used).
Addresses D0000h up to
FFFFFh (192 KB) are available
(addresses 40000h to CFFFFh
cannot be used).
04000h to Usable
0CFFFh
40000h to Usable
7FFFFh
80000 to Usable
CFFFFh
04000h to Usable
0CFFFh
40000h to Usable
7FFFFh
80000 to Usable
CFFFFh
Reserved area When program ROM 1 is available, then
External area
External area
Bit Setting
The entire area is usable.
Addresses 80000h up to
FFFFFh are available
(addresses 40000h to 7FFFFh
cannot be used).
Reserved
Usable
Reserved
Reserved
Usable
Usable
0
program ROM 1. When program ROM 1 is not
available, then reserved area.
External area
10. Processor Mode
PM13 = 1
1
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