PIC17C75X
The PIC17C75X 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.
TABLE 7-1:
MODE MEMORY ACCESS
Internal
Program
Memory
Configuration Bits,
Test Memory,
Boot ROM
Operating
Mode
Regardless of the processor mode, data memory is
always on-chip.
Microprocessor
Microcontroller
No Access
Access
No Access
Access
Extended
Microcontroller
Access
Access
No Access
Access
Protected
Microcontroller
FIGURE 7-2: MEMORY MAP IN DIFFERENT MODES
Extended
Microcontroller
Mode
Microcontroller
Modes
Microprocessor
Mode
0000h
0000h
0000h
On-chip
Program
Memory
On-chip
Program
Memory
01FFFh
2000h
01FFFh
2000h
External
Program
Memory
External
Program
Memory
PIC17C752
Config. Bits
Test Memory
Boot ROM
FE00h
FFFFh
FFFFh
FFFFh
OFF-CHIP
ON-CHIP
00h
OFF-CHIP
ON-CHIP
00h
OFF-CHIP
ON-CHIP
00h
120h
120h
120h
FFh 1FFh
ON-CHIP
FFh 1FFh
ON-CHIP
FFh 1FFh
ON-CHIP
0000h
3FFFh
0000h
0000h
On-chip
Program
Memory
On-chip
Program
Memory
3FFFh
4000h
External
Program
Memory
4000h
External
Program
Memory
PIC17C756
Config. Bits
Test Memory
Boot ROM
FE00h
FFFFh
FFFFh
FFFFh
OFF-CHIP
00h
ON-CHIP
OFF-CHIP
ON-CHIP
OFF-CHIP
ON-CHIP
00h
00h
120h
120h
320h
3FFh
320h
120h
220h
2FFh
220h
2FFh
320h
220h
2FFh
FFh 1FFh
FFh 1FFh
3FFh
FFh 1FFh
3FFh
ON-CHIP
ON-CHIP
ON-CHIP
DS30264A-page 40
Preliminary
1997 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
