UPD78P4916 Datasheet, PDF (21/56 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER

µPD78P4916
4. PROM PROGRAMMING
The µPD78P4916 has on-chip 62-Kbyte PROM as the program memory. The PROM programming mode is
entered by setting VDD, IC/VPP, and RESET pins as specified. For the settings of the unused pins in this mode,
refer to the drawing of “(2) PROM Programming Mode” in the section “Pin Configuration (Top View)”.
4.1 Operation Mode
The PROM programming mode is entered by applying +5 V or +12 V to the IC/VPP pin, +5 V or +6.5 V to the VDD
pins, and low-level voltage to the RESET pin. Table 4-1 shows the operation mode specified by the CE, OE, and
PGM pins.
It is possible to read the contents of PROM by setting up read operation mode.
Table 4-1. Operation Mode of PROM Programming
Operation mode
Page data latch
Page write
Byte write
Program verify
Program inhibit
Read
Output disable
Standby
Pins
RESET IC/VPP
VDD
CE
L +12.5 V +6.5 V
H
H
L
L
×
×
+5 V +5 V
L
L
H
Remark × : Low or high level
OE
PGM
D0 - D7
L
H
Data input
H
L
High impedance
H
L
Data input
L
H
Data output
H
H
High impedance
L
L
L
H
Data output
H
×
High impedance
×
×
High impedance
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