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2002 Microchip Technology Inc.
DS41120B-page 9
PIC16C717/770/771
2.0
MEMORY ORGANIZATION
There are two memory blocks in each of these PICmi-
cro microcontrollers. Each block (Program Memory
and Data Memory) has its own bus, so that concurrent
access can occur.
Additional information on device memory may be found
in the PICmicro
Mid-Range MCU Family Reference
Manual, (DS33023).
2.1
Program Memory Organization
The PIC16C717/770/771 devices have a 13-bit pro-
gram counter capable of addressing an 8K x 14 pro-
gram memory space. The PIC16C717 and the
PIC16C770 have 2K x 14 words of program memory.
The PIC16C771 has 4K x 14 words of program mem-
ory. Accessing a location above the physically imple-
mented address will cause a wrap-around.
The RESET vector is at 0000h and the interrupt vector
is at 0004h.
FIGURE 2-1:
PROGRAM MEMORY MAP
AND STACK OF THE
PIC16C717 AND PIC16C770
FIGURE 2-2:
PROGRAM MEMORY MAP
AND STACK OF THE
PIC16C771
2.2
Data Memory Organization
The data memory is partitioned into multiple banks,
which contain the General Purpose Registers and the
Special Function Registers. Bits RP1 and RP0 are the
bank select bits.
= 00
→ Bank0
= 01
→ Bank1
= 10
→ Bank2
= 11
→ Bank3
Each bank extends up to 7Fh (128 bytes). The lower
locations of each bank are reserved for the Special
Function Registers. Above the Special Function Regis-
ters are General Purpose Registers, implemented as
static RAM. All implemented banks contain special
function registers. Some frequently used special func-
tion registers from one bank are mirrored in another
bank for code reduction and quicker access.
2.2.1
GENERAL PURPOSE REGISTER FILE
The register file can be accessed either directly, or indi-
rectly, through the File Select Register FSR.
PC<12:0>
13
0000h
0004h
0005h
Stack Level 1
Stack Level 8
RESET Vector
Interrupt Vector
On-chip
CALL, RETURN
RETFIE, RETLW
Stack Level 2
Program
Memory
Page 0
07FFh
3FFFh
RP1
RP0
(STATUS<6:5>)
PC<12:0>
13
0000h
0004h
0005h
Stack Level 1
Stack Level 8
RESET Vector
Interrupt Vector
On-chip
CALL, RETURN
RETFIE, RETLW
Stack Level 2
Program
Memory
Page 0
Page 1
07FFh
0800h
0FFFh
1000h
3FFFh
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相关PDF资料
PIC16LC770T-E/SO
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PIC16LC717T-I/SS
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