PIC12C672 MICROCHIP [Microchip Technology], PIC12C672 Datasheet - Page 11

• Manufacturer Part Number: PIC12C672
• Description: 8-Pin, 8-Bit CMOS Microcontroller with EEPROM Data Memory
• Manufacturer: MICROCHIP [Microchip Technology]

4.0
PIC12CE5XX memory is organized into program mem-
ory and data memory. For devices with more than 512
bytes of program memory, a paging scheme is used.
Program memory pages are accessed using one STA-
TUS register bit. For the PIC12CE519 with a data
memory register file of more than 32 registers, a bank-
ing scheme is used. Data memory banks are accessed
using the File Select Register (FSR).
4.1
The PIC12CE5XX devices have a 12-bit Program
Counter (PC) capable of addressing a 2K x 12
program memory space.
Only the first 512 x 12 (0000h-01FFh) for the
PIC12CE518 and 1K x 12 (0000h-03FFh) for the
PIC12CE519 are physically implemented. Refer to
Figure 4-1. Accessing
boundaries will cause a wrap-around within the first
512 x 12 space (PIC12CE518) or 1K x 12 space
(PIC12CE519). The effective reset vector is at 000h,
(see Figure 4-1). Location 01FFh (PIC12CE518) or
location 03FFh (PIC12CE519), the hardwired reset
vector location, contains the internal clock oscillator
calibration value. This value is set at Microchip and
should never be overwritten.
MOVLW XX is executed, the PC wraps to location
0000h, thus making 0000h the effective reset vector.
1997 Microchip Technology Inc.
MEMORY ORGANIZATION
Program Memory Organization
a
location
Upon reset, the
above
these
Preliminary
FIGURE 4-1:
Note 1: Address 0000h becomes the
CALL, RETLW
effective reset vector. Location
01FFh (PIC12CE518) or location
03FFh (PIC12CE519) contains the
MOVLW XX INTRC oscillator
calibration value.
1024 Word (PIC12CE519)
512 Word (PIC12CE518)
PROGRAM MEMORY MAP
AND STACK FOR THE
PIC12CE5XX
Reset Vector (note 1)
On-chip Program
On-chip Program
PIC12CE5XX
Stack Level 1
Stack Level 2
PC<11:0>
Memory
Memory
12
DS40172A-page 11
7FFh
0000h
01FFh
0200h
03FFh
0400h