PD17012_15 Datasheet, PDF (305/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
25.3 Program Memory Read Procedure
(1) Pull down unused pins to GND via a resistor. Set the CLK pin to low.
(2) Supply 5 V to the VDD pin. Set the VPP pin to low.
(3) Wait for 10 µs and then supply 5 V to the VPP pin.
(4) Set the mode setting pin to program memory address 0-clear mode.
(5) Supply +6 V to the VDD pin and +12.5 V to the VPP pin.
(6) Set the program inhibit mode.
(7) Set the verify mode. Addresses are incremented by one for each 4-pulse cycle input to the CLK pin.
(8) Set the program inhibit mode.
(9) Set the program memory address 0-clear mode.
(10) Change the VDD and VPP pins to 5 V.
(11) Turn off the power.
The following figure shows steps (2) to (9).
Reset
VPP
VPP
VDD
GND
VDD + 1
VDD
VDD
GND
CLK
One cycle
D0 to D7
Hi-Z
Data output
Data output
Hi-Z
MD0
MD1
“L”
MD2
MD3
Data Sheet U10101EJ4V0DS
303