PIC17C4X Datasheet, PDF (30/240 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PIC17C4X
TABLE 6-1: MODE MEMORY ACCESS
Operating
Mode
Microprocessor
Microcontroller
Extended
Microcontroller
Protected
Microcontroller
Internal
Program
Memory
No Access
Access
Configuration 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 Config. 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 Config. 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.