7733 Datasheet, PDF (513/940 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

BUILT-IN PROM VERSION
19.1 EPROM mode
(1) Read
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When pins CE and OE are set to “L” level and an address is input to address input pins, the contents
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of the built-in PROM can be read from data I/O pins; When pins CE and OE are set to “H” level, data
I/O pins enter the floating state.
(2) Program
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When pin CE is set to “L” level, pin OE is set to “H” level, and VPP level is applied to pin VPP,
programming to the PROM can be performed.
Input an address to address input pins and supply data to be programmed to data I/O pins in 8-bit
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parallel. On this condition, when pin PGM is set to “L” level, the data is programmed into the built-in
PROM.
(3) Erase (Available only in EPROM version)
The contents of the built-in PROM is erased by exposing the glass window on top of the package to
an ultraviolet light which has a wave length of 2537 Angstrom. The light must be 15 W•s/cm² or more.
Table 19.1.4 I/O signals in EPROM mode
Mode
Pin name
CE
OE
PGM
VPP
Vcc
Read-out
VIL
VIL
X
5V
5V
Output
VIL
VIH
X
5V
5V
disable
VIH
X
X
5V
5V
Program
VIL
VIH
VIL
12.5 V
6V
Program verify
VIL
VIL
VIH
12.5 V
6V
Program disable
VIH
VIH
VIH
12.5 V
6V
X : It may be VIL or VIH.
Data I/O
Output
Floating
Floating
Input
Output
Floating
7733 Group User’s Manual
19-7