UPD78P324LP datasheet(17/80 Pages) NEC

17 / 80 page

µPD78P324, 78P324(A)

PROM PROGRAMMING

The

µPD78P324 incorporates an electrically writable 32768-by-8-bit program PROM and an 8192-by-6-bit

ECC (error correcting code) PROM.

ECC corrects the errors in codes written in the program PROM, thus improving the reliability of the PROM

content. Figure 3-1 shows the memory map in programming mode.

Figure 3-1. Memory Map in Programming Mode

ECC (for ECW)

ECW

(4 x 8)

PROM for ECCNote

(8192 x 6)

Program PROM

(32768 x 8)

A004H

A003H

A000H

9FFFH

8000H

7FFFH

0000H

Note

On the ECC PROM, the lower 6 bits are valid.

When programming, set the RESET pin and the AVDD pin to PROM programming mode. The programming

characteristics of the

µPD78P324 are compatible with the µPD27C1001A. However, the programming mode

is compatible only with the byte program mode of the

µPD27C1001A. For setting on the PROM programmer,

please select the byte program mode of the 27C1001A mode.

When using the ECC circuit, reset the lowest bit (A000.0) of the lowest byte of the ECW (ECC control word)

to enable the operation of the ECC circuit. ECW is a 4-byte register which controls the operation of the ECC

circuit. ECC and ECW are generated automatically with the ECCGEN (ECC generator) which comes with the

RA78K3 assembler package. (ECC is generated in the lower 6 bits; and the upper 2 bits are fixed to 1.)

UPD78P324LP датащи(PDF) 17 Page - NEC