PIC17C756A MICROCHIP [Microchip Technology], PIC17C756A Datasheet - Page 65

• Manufacturer Part Number: PIC17C756A
• Description: High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

8.4
When the table reads/writes are accessing external
memory (via the external system interface bus), the
table latch for the table reads is different from the table
latch for the table writes (see Figure 8-9).
This means that you cannot do a TABLRD instruction,
and use the values that were loaded into the table
latches for a TABLWT instruction. Any table write
sequence should use both the TLWT and then the
TABLWT instructions.
FIGURE 8-9:
2000 Microchip Technology Inc.
Operation with External Memory
Interface
TABLATH (for Table Reads)
TABLATH (for Table Writes)
ACCESSING EXTERNAL MEMORY WITH TABLRD AND TABLWT INSTRUCTIONS
TABLPTR
TABLRD
TABLWT
(In External Memory Space)
Program Memory
PIC17C7XX
DS30289B-page 65