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PIC17C44 Datasheet, PDF (30/241 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller | |||
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PIC17C4X
TABLE 6-1: MODE MEMORY ACCESS
Operating
Mode
Microprocessor
Microcontroller
Extended
Microcontroller
Protected
Microcontroller
Internal
Program
Memory
No Access
Access
Conï¬guration Bits,
Test Memory,
Boot ROM
No Access
Access
Access
No Access
Access
Access
The PIC17C4X can operate in modes where the pro-
gram memory is off-chip. They are the microprocessor
and extended microcontroller modes. The micropro-
cessor mode is the default for an unprogrammed
device.
Regardless of the processor mode, data memory is
always on-chip.
FIGURE 6-2: MEMORY MAP IN DIFFERENT MODES
PIC17C42,
PIC17CR42,
PIC17C42A
0000h
Microprocessor
Mode
External
Program
Memory
0800h
Extended
Microcontroller
Mode
0000h
On-chip
Program
Memory
07FFh
External
Program
Memory
FFFFh
OFF-CHIP
ON-CHIP
00h
FFFFh
OFF-CHIP
ON-CHIP
00h
Microcontroller
Modes
0000h
07FFh
0800h
On-chip
Program
Memory
FE00h Conï¬g. Bits
Test Memory
FFFFh Boot ROM
OFF-CHIP
ON-CHIP
00h
PIC17C43,
PIC17CR43,
PIC17C44
OFF-CHIP
FFh
ON-CHIP
0000h
External
Program
Memory
OFF-CHIP
FFh
ON-CHIP
0000h
0FFFh/1FFFh
On-chip
Program
Memory
1000h/
2000h
External
Program
Memory
FFFFh
OFF-CHIP
ON-CHIP
FFFFh
OFF-CHIP
ON-CHIP
OFF-CHIP
FFh
ON-CHIP
0000h
0FFFh/1FFFh
1000h/2000h
On-chip
Program
Memory
FE00h Conï¬g. Bits
Test Memory
FFFFh Boot ROM
OFF-CHIP
ON-CHIP
00h
120h
00h
120h
00h
120h
FFh
1FFh
OFF-CHIP
ON-CHIP
FFh
1FFh
OFF-CHIP
ON-CHIP
FFh
OFF-CHIP
1FFh
ON-CHIP
DS30412C-page 30
© 1996 Microchip Technology Inc.
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