UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 69

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

2.2.2 PROM Programming Mode ( PD78P4026)
(1) V
(2) RESET (Reset) ... Input
(3) A0 to A16 (Address Bus) ... Input
(4) D0 to D7 (Data Bus) ... Input/Output
(5) CE (Chip Enable) ... Input
(6) OE (Output Enable) ... Input
(7) PGM (Program) ... Input
(8) V
(9) V
Input pin that sets the PD78P4026 to the PROM programming mode. When the input voltage of this pin is +5 V or more
and the RESET input is driven low, the PD78P4026 switches to the PROM programming mode.
If CE = L is set when V
selected by A0 to A16.
Input pin that sets the PD78P4026 to the PROM programming mode. When the input voltage of the V
V or more and the input of this pin is low, the PD78P4026 switches to the PROM programming mode.
The address bus. Selects an internal PROM address (0000H to 7FFFH).
The data bus. Internal PROM program reads and writes are performed via this bus.
Inputs the internal PROM enable signal. When this signal is active, program writing/reading is enabled.
Inputs the internal PROM read strobe signal. When this signal is activated while CE = L, the program data (1 byte) in the
internal PROM cell selected by A0 to A16 can be read onto D0 to D7.
The internal PROM operating mode control signal input pin.
When this signal is active, it is possible to write to internal PROM.
When this signal is inactive, it is possible to read from internal PROM.
Positive power supply pins.
GND potential pins.
PP
DD
SS
(Programming Power Supply) ... Input
PP
= +12.5 V and OE = H, the program data on D0 to D7 can be written in the internal PROM cell
CHAPTER 2 PIN FUNCTIONS
PP
pin reaches +5
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