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HN58X2508I Datasheet(PDF) 20 Page - Renesas Technology Corp

Part No. HN58X2508I
Description  Electrically Erasable and Programmable Read Only Memory
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HN58X2508I Datasheet(HTML) 20 Page - Renesas Technology Corp

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HN58X2508I/HN58X2516I
Rev.2.00, Aug.19.2004, page 20 of 27
Write to Memory Array (WRITE):
As shown in the following figure, to send this instruction to the device, chip select (
S) is first driven low.
The bits of the instruction byte, address byte, and at least one data byte are then shifted in, on serial data input
(D).
The instruction is terminated by driving chip select (
S) high at a byte boundary of the input data. In the case
of the following figure, this occurs after the eighth bit of the data byte has been latched in, indicating that the
instruction is being used to write a single byte. The self-timed Write cycle starts, and continues for a period
tWC (as specified in AC Characteristics). At the end of the cycle, the Write In Progress (WIP) bit is reset to 0.
If, though, chip select (
S) continues to be driven low, as shown in the following figure, the next byte of the
input data is shifted in, so that more than a single byte, starting from the given address towards the end of the
same page, can be written in a single internal Write cycle.
Each time a new data byte is shifted in, the least significant bits of the internal address counter are
incremented. If the number of data bytes sent to the device exceeds the page boundary, the internal address
counter rolls over to the beginning of the page, and the previous data there are overwritten with the incoming
data. (The page size of these device is 32 bytes).
The instruction is not accepted, and is not executed, under the following conditions:
If the Write Enable Latch (WEL) bit has not been set to 1 (by executing a Write Enable
instruction just before)
If a Write cycle is already in progress
If the addressed page is in the region protected by the Block Protect (BP1 and BP0) bits.
Byte Write (WRITE) Sequence (1 Byte)
S
W
C
D
Q
16-Bit Address
Data Byte 1
01
2
3
4
5
6
7
0
1
2
3
13
14
15
8
9
10
20
21 22 23 24 25 26 27 28 29 30
31
High-Z
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
4
5
6
7
0
1
2
3
Instruction
Note:
1. Depending on the memory size, as shown in Address Range Bits table, the most significant address
bits are don’t care.


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