HD404829R Datasheet, PDF (109/149 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a LCD controller/Driver Circuit

HD404829R Series
Writing/verification
Programming of the built-in program ROM employs a high speed programming method. With this method,
high speed writing is effected without voltage stress to the device or without damaging the reliability of the
written data.
A basic programming flow chart is shown in figure 96 and a timing chart in figure 97.
For precautions for PROM writing procedure, refer to Section 2, "Characteristics of ZTAT^{T M}
Microcomputer's Built-in Programmable ROM and precautions for its Applications."
Table 25 Selection of Mode
Mode
Writing
Verification
Prohibition of programming
CE
“Low”
“High”
“High”
OE
VPP
“High”
VPP
“Low”
VPP
“High”
VPP
O0 – O7
Data input
Data output
High impedance
Table 26 PROM Writer Program Address
ROM size
8k
12k
16k
Address
$0000 – $3FFF
$0000 – $5FFF
$0000 – $7FFF
107