PD17012_15 Datasheet, PDF (303/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
25. ONE-TIME PROM (PROGRAM MEMORY) WRITE AND VERIFY (µPD17P012 ONLY)
The µPD17P012 includes a 4,096 × 16-bit one-time PROM program memory.
The pins used for the write/verify operations of this one-time PROM are listed in Table 25-1. Clock input from the
CLK pin, instead of address input, is used for updating addresses.
Pin Name
VPP
VDD1, VDD2
CLK
MD0 to MD3
D0 to D7
Table 25-1. Pins Used for Program Memory Write/Verify
Function
Pin used to apply the program voltage when writing, reading, or verifying the program memory. Apply
+12.5 V.
Power supply. Supply +6 V to these pins when writing, reading, or verifying the program memory.
Clock input to update addresses when writing, reading, or verifying the program memory.
Program memory addresses are updated by inputting a pulse to the CLK pin four times.
Input to select the operation mode when writing, reading, or verifying the program memory.
8-bit data I/O when writing, reading, or verifying the program memory.
25.1 Operation Modes for Program Memory Write/Verify
When +6 V is applied to the VDD pin and +12.5 V to the VPP pin after the reset status (VDD = 5 V and RESET = 0
V) has continued for a certain time, the µPD17P012 enters the program memory write/verify mode. The following
operation modes can be set by setting pins MD0 to MD3 as shown below. Pins not listed in Table 25-1 should be left
open, or connected to GND via a pull-down resistor (470 Ω) (refer to PIN CONFIGURATION (2) µPD17P012 (b) PROM
programming mode).
Table 25-2. Operation Mode Setting
Operation Mode Setting
VPP
VDD
MD0
MD1
MD2
+12.5 V +6 V
H
L
H
L
H
H
L
L
H
H
×
H
×: Don’t care (L or H)
Operation Mode
MD3
L
Program memory address 0-clear mode
H
Write mode
H
Verify mode
H
Program inhibit mode
Data Sheet U10101EJ4V0DS
301