NEC PD75P402 User Manual Page 21

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CHAPTER 2. PIN FUNCTIONS
10
CHAPTER 2. PIN FUNCTIONS
The
µ
PD75402A operates by the pin functions in the normal operating mode.
For the
µ
PD75P402’s pin functions, the 2 modes of the normal operating mode (
µ
PD75402A mode) and the PROM
mode are available.
The operating mode switches according to the V
PP pin level as shown in the table below.
VPP Operating Mode
Low level (GND potential) Normal operating mode
High level (+5 V) PROM read mode
High level (+12.5 V) PROM write/verify mode
PROM mode
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