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TC9WMC1FK Datasheet(PDF) 4 Page - Toshiba Semiconductor

Part # TC9WMC1FK
Description  CMOS Digital Integrated Circuits Silicon Monolithic
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Manufacturer  TOSHIBA [Toshiba Semiconductor]
Direct Link  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TC9WMC1FK Datasheet(HTML) 4 Page - Toshiba Semiconductor

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TC9WMC1FK/FU,TC9WMC2FK/FU
2007-10-19
4
(3) Write operation (WRITE, ERASE, WRAL, ERAL)
The write operation has four modes: Write (WRITE), Erase (ERASE), Write All (WRAL) and Erase
All (ERAL). The write operation is triggered when the CS is driven Low after the SK pulse is applied.
The SK and DI inputs are disabled during the write operation, so no attempt should be made to
transfer instructions at this time.
If 16-bit or longer data is transferred to the device, the first 16 bits of data are valid and the
remaining bits are ignored. The DO output must be held High or in the high-impedance state when a
write instruction is received. A write operation is enabled in program enable mode.
(3.1) Verify operation
A write operation in all write modes is completed within 10 ms (write cycle tPW), but the typical
write cycle is shorter (5 ms). If the completion of the write operation is known, the internal write
cycle can be minimized. To accomplish this, a verify operation is performed.
(a) Operational description
When the CS is brought High following the initiation of a write operation (CS = Low), the
write operation status can be seen by monitoring the DO pin. This is called a verify operation
and the period during which the CS is held High following the initiation of a write operation is
called a verify operation cycle.
• DO pin = Low: A write operation is in progress. (busy)
• DO pin = High: A write operation has been completed. (ready)
After the write operation is completed, and if a start bit is not identified, the DO pin goes to
the high-impedance state if the CS is Low. If the CS is Low, the DO pin is driven High. When
the write operation is in progress (busy), the SK and DI inputs are disabled. Once the write
operation has been completed and a start bit is received, the verify operation is stopped.
(b) Two operation methods
There are two ways to perform a verify operation. One way is to monitor the DO output
successively with the CS driven High until the DO output status changes. The other way is to
monitor the DO output and, if no change is evident, the verify operation is stopped (CS = Low).
The verify operation is then restarted by the CS being pulled High. In this way, when the DO
output is not being monitored, the CPU is free for other operations, thus allowing more efficient
design of electronic systems.
Figure 2. Read Timing Diagram (TC9WMC2)
CS
SK
1 2
7 8 9 10 11 12 13
26 27 28
1 1 0
DI
DO
Hi-Z
A5
3 4 5 6
A4 A3 A2 A1 A0
D15 D14 D13
D1 D0 D15 D14
D2 D1 D0 D15
Hi-Z
29
41 42
14
44
43
A6
x


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