HD6432646 Hitachi, HD6432646 Datasheet - Page 733
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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Table 20-11 Programmer Mode Commands
Command Name
Memory read mode
Auto-program mode
Auto-erase mode
Status read mode
Notes: 1. In auto-program mode, 129 cycles are required for command writing by a simultaneous
20.11.3 Memory Read Mode
1. After completion of auto-program/auto-erase/status read operations, a transition is made to the
2. In memory read mode, command writes can be performed in the same way as in the command
3. Once memory read mode has been entered, consecutive reads can be performed.
4. After powering on, memory read mode is entered.
Table 20-12 AC Characteristics in Transition to Memory Read Mode
Item
Command write cycle
CE hold time
CE setup time
Data hold time
Data setup time
Write pulse width
WE rise time
WE fall time
command wait state. When reading memory contents, a transition to memory read mode must
first be made with a command write, after which the memory contents are read.
wait state.
2. In memory read mode, the number of cycles depends on the number of address write
128-byte write.
cycles (n).
(Conditions: V
Number
of Cycles
1 + n
129
2
2
CC
= 5.0 V ±0.5 V, V
Mode
Write
Write
Write
Write
Symbol
t
t
t
t
t
t
t
t
nxtc
ceh
ces
dh
ds
wep
r
f
1st Cycle
Address Data
X
X
X
X
SS
Min
20
0
0
50
50
70
—
—
= 0 V, T
H'00
H'40
H'20
H'71
a
= 25°C ±5°C)
Max
—
—
—
—
—
—
30
30
Mode
Read
Write
Write
Write
2nd Cycle
Address Data
RA
WA
X
X
Unit
µs
ns
ns
ns
ns
ns
ns
ns
Dout
Din
H'20
H'71
699
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