PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 67

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

5.1.2
The Table Latch (TABLAT) is an 8-bit register mapped
into the SFR space. The Table Latch is used to hold
8-bit data during data transfers between program
memory and data memory.
5.1.3
The Table Pointer (TBLPTR) addresses a byte within
the program memory. The TBLPTR is comprised of
three SFR registers (Table Pointer Upper byte, High
byte
(TBLPTRU:TBLPTRH:TBLPTRL) join to form a 22-bit
wide pointer. The low order 21-bits allow the device to
TABLE 5-1:
 2000 Microchip Technology Inc.
TBLRD*
TBLWT*
TBLRD*+
TBLWT*+
TBLRD*-
TBLWT*-
TBLRD+*
TBLWT+*
Example
and
TABLAT - TABLE LATCH REGISTER
TBLPTR - TABLE POINTER REGISTER
Low
TABLE POINTER OPERATIONS WITH TBLRD AND TBLWT INSTRUCTIONS
TBLPTR is not modified
TBLPTR is incremented after the read/write
TBLPTR is decremented after the read/write
TBLPTR is incremented before the read/write
byte).
These
three
Advanced Information
registers
Operation on Table Pointer
address up to 2 Mbytes of program memory space. The
22nd bit allows read only access to the Device ID, the
User ID and the Configuration bits.
The table pointer TBLPTR is used by the TBLRD and
TBLWT instructions. These instructions can update the
TBLPTR in one of four ways based on the table oper-
ation. These operations are shown in Table 5-1.
These operations on the TBLPTR only affect the low
order 21-bits.
PIC18CXX8
DS30475A-page 67