µPD17P207

13

2.

ONE-TIME PROM (PROGRAM MEMORY) WRITING, READING, AND VERIFICATION

µPD17P207 sets the PROM mode when PROM writing, reading or verification as shown in Table 2-1.

In PROM mode, no address input pin is used. Instead, the address is updated by the clock for input from the CLK pin.

Function

Applies program voltage (12.5 V).

Inputs address update clock.

Selects operation mode.

Inputs and outputs 8-bit data.

Applies supply voltage (6 V).

Pin Name

CLK

2.1

OPERATION MODE FOR WRITING, READING, AND VERIFICATION OF PROGRAM MEMORY

µPD17P207 has been placed in the reset status for a fixed

µPD17P207 enters program memory write, read, or verify mode.

Leave the pins not used for program memory writing, reading, or verification open or ground through pull-down resistors

(470

Ω). (Refer to (2) PROM programming mode in PIN CONFIGURATION.)

Table 2-2. Operating Mode for Program Memory Writing, Reading or Verification

Operating Mode Specification

Remark

x: L or H

HL

H

L

LH

H

H

LL

H

H

Hx

H

H

+6 V

+12.5 V

Operating Mode

Program memory address 0 clear mode

Write mode

Read/verify mode

Program inhibit mode

Table 2-1. Pins Used for Program Memory Writing, Reading, or Verification