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AK6514C Datasheet(PDF) 8 Page - Asahi Kasei Microsystems

No. de Pieza. AK6514C
Descripción  SPI bus 64Kbit Serial CMOS EEPROM
Descarga  18 Pages
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Fabricante  AKM [Asahi Kasei Microsystems]
Página de inicio  http://www.akm.com
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AK6514C Datasheet(HTML) 8 Page - Asahi Kasei Microsystems

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ASAHI KASEI
[AK6514C]
DAP04E-00
2005/03
- 8 -
WRSR (WRITE STATUS REGISTER)
The WRSR instruction can set the Write Protect Block size of the memory array.
AK6514C has 4 Blocks of memory arrays.
Write Protect Block size can be selected from 1/4, 1/2
and whole memory array.
The block, which is set by Write Protect, is Read only.
BP0 bit, BP1 bit, and WPEN bit are programmable with EEPROM memory cell bits.
The
characteristics of those bits (WREN, tE/W, RDSR) are same as the EEPROM memory array.
WP pin function can be set by WPEN (WRITE PROTECT ENABLE) bit which is defined by WRSR
function.
When WP pin is low level and WPEN bit is "1", the WRITE function to Status register,
which has WPEN bit and BP0/BP1 bit, and to Write Disable Block is not performed.
Then WRITE
function is performed only to the Write enable block.
When WP pin is "1" or WPEN bit is "0", then the function of WP pin is disabled and WRITE function
to the Status Register is performed.
WREN function should be done before WRSR function.
And after the Programming function,
AK6514C becomes Write Disable status automatically.
WRSR
WPEN
Bit
WP
Pin
WEN
Bit
Write Protected
Block
Not Protected
Block
Status Register
0
X
0
WRITE Disable
WRITE Disable
WRITE Disable
0
X
1
WRITE Disable
WRITE Enable
WRITE Enable
1
Low
0
WRITE Disable
WRITE Disable
WRITE Disable
1
Low
1
WRITE Disable
WRITE Enable
WRITE Disable
X
High
0
WRITE Disable
WRITE Disable
WRITE Disable
X
High
1
WRITE Disable
WRITE Enable
WRITE Enable
Table 3. WPEN function
Status Register bits
BP1
BP0
Write Protected
Block
0
0
none
0
1
3000h - 3FFFh
1
0
2000h - 3FFFh
1
1
0000h - 3FFFh
Table 4. Write Protected Block Size
Hi-Z
0123456789
10
11
12
13
14
15
0
0
0
0
00
1
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Bit0
CS
SCK
SI
SO
X = don’t care
X


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