PIC18F66K22-I/PTRSL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F66K22-I/PTRSL

64/80-Pin, High-Performance, 1-Mbit Enhanced Flash Microcontrollers with 12-Bit A/D and nanoWatt XLP Technology

Microchip Technology 

PIC18F87K22 FAMILY

8.6.1 16-BIT BYTE WRITE MODE

Figure 8-1 shows an example of 16-Bit Byte Write

mode for PIC18F87K22 family devices. This mode is

used for two separate 8-bit memories connected for

16-bit operation. This generally includes basic EPROM

and Flash devices. It allows table writes to byte-wide

external memories.

During a TBLWT instruction cycle, the TABLAT data is

presented on the upper and lower bytes of the

AD<15:0> bus. The appropriate WRH or WRL control

line is strobed on the LSb of the TBLPTR.

FIGURE 8-1:

16-BIT BYTE WRITE MODE EXAMPLE

D<7:0>

PIC18F87K22

AD<7:0>

AD<15:8>

ALE

A<19:16>(1)

CE

OE

WRH

WRL

373

A<19:0>

D<15:8>

373

(MSB)

A<x:0>

D<7:0>

CE

OE WR(2)

(LSB)

A<x:0>

D<7:0>

D<7:0>

CE

OE WR(2)

Address Bus

Data Bus

Control Lines

Note 1: Upper order address lines are used only for 20-bit address widths.

2: This signal only applies to table writes. See Section 7.1 “Table Reads and Table Writes”.

 2009-2011 Microchip Technology Inc.

DS39960D-page 125

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