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H838532H bảng dữ liệu(PDF) 166 Page - Renesas Technology Corp

tên linh kiện H838532H
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H838532H bảng dữ liệu(HTML) 166 Page - Renesas Technology Corp

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Section 6 ROM
Rev. 1.00 May 30, 2008 Page 146 of 484
REJ09B0436-0100
6.7.3
Memory Read Mode
1. After completion of auto-program/auto-erase/status read operations, a transition is made to the
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. Once memory
read mode has been entered, consecutive reads can be performed.
2. In memory read mode, command writes can be performed in the same way as in the command
wait state.
3. After powering on, memory read mode is entered.
4. Tables 6.10 to 6.12 show the AC characteristics.
Table 6.10
AC Characteristics in Transition to Memory Read Mode
Conditions: V
CC = 3.3 V ±0.3 V, VSS = 0 V, Ta = 25°C ±5°C
Item
Symbol
Min
Max
Unit
Notes
Command write cycle
t
nxtc
20
—
µs
Figure 6.7
CE hold time
t
ceh
0
—
ns
CE setup time
t
ces
0
—
ns
Data hold time
t
dh
50
—
ns
Data setup time
t
ds
50
—
ns
Write pulse width
t
wep
70
—
ns
WE rise time
t
r
—
30
ns
WE fall time
t
f
—
30
ns
CE
OE
CE
A15
−A0
OE
WE
I/O7
−I/O0
Note: Data is latched on the rising edge of
WE.
tceh
twep
tf
tr
tces
tnxtc
Address stable
tds
tdh
Command write
Memory read mode
Figure 6.7 Timing Waveforms for Memory Read after Memory Write



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