7702 Datasheet, PDF (423/522 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

PROM VERSION
19.4 256K mode
19.4.1 Read/Program/Erase
Table 19.4.2 lists the built-in PROM state in 256K mode and each mode is described bellow.
(1) Read
___
___
When pins CE and OE are set to “L” level and an address is input to address input pins, the contents
of the built-in PROM can be output from data I/O pins and read.
___
___
When pins CE and OE are set to “H” level, data I/O pins enter the floating state.
(2) Program (Write)
___
When pin OE is set to “H” level and VPP level is applied to pin VPP, programming to the built-in PROM
becomes possible.
Input an address to address input pins and supply data to be programmed to data I/O pins in 8-bit
___
parallel. In this condition, when pin CE is set to “L” level, the data is programmed at the specified
address, input address, into the built-in PROM.
(3) Erase (Possible 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 J/cm² or more.
Table 19.4.2 Built-in PROM state in 256K mode
Pin name
__
CE
Mode
__
OE
VPP
Vcc
Read-out
VIL
VIL
5V
5V
Output
disable
VIL
VIH
5V
5V
VIH
!
5V
5V
Program
VIL
VIH
12.5 V
6V
Program verify
VIH
VIL
12.5 V
6V
Program disable
VIH
! : It may be VIL or VIH.
VIH
12.5 V
6V
Data I/O
Output
Floating
Floating
Input
Output
Floating
7702/7703 Group User’s Manual
19–15