BS85B12-3 Datasheet, PDF (35/182 Pages) Holtek Semiconductor Inc – Touch Key Flash Type 8-Bit MCU with LCD/LED Driver

BS85B12-3/BS85C20-3
Touch Key Flash MCU with LCD/LED Driver
EEA Register
· BS85B12-3
Bit
7
6
5
4
3
2
1
0
Name
¾
¾
D5
D4
D3
D2
D1
D0
R/W
¾
¾
R/W
R/W
R/W
R/W
R/W
R/W
POR
¾
¾
x
x
x
x
x
x
²x² unknown
Bit 7, 6
unimplemented, read as ²0²
Bit 5~0
Data EEPROM address
Data EEPROM address bit 5~bit 0
· BS85C20-3
Bit
7
6
5
4
3
2
1
0
Name
¾
D6
D5
D4
D3
D2
D1
D0
R/W
¾
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
¾
x
x
x
x
x
x
x
²x² unknown
Bit 7
Bit 6~0
unimplemented, read as ²0²
Data EEPROM address
Data EEPROM address bit 6~bit 0
EEC Register
Bit
7
6
5
4
3
2
1
0
Name
¾
¾
¾
¾
WREN
WR
RDEN
RD
R/W
¾
¾
¾
¾
R/W
R/W
R/W
R/W
POR
¾
¾
¾
¾
0
0
0
0
Bit 7~4
unimplemented, read as ²0²
Bit 3
WREN: data EEPROM write enable
0: disable
1: enable
This is the Data EEPROM Write Enable Bit which must be set high before Data EEPROM write
operations are carried out. Clearing this bit to zero will inhibit Data EEPROM write operations.
Bit 2
WR: EEPROM write control
0: Write cycle has finished
1: Activate a write cycle
This is the Data EEPROM Write Control Bit and when set high by the application program will
activate a write cycle. This bit will be automatically reset to zero by the hardware after the write
cycle has finished. Setting this bit high will have no effect if the WREN has not first been set high.
Bit 1
RDEN: Data EEPROM read enable
0: disable
1: enable
This is the Data EEPROM Read Enable Bit which must be set high before Data EEPROM read
operations are carried out. Clearing this bit to zero will inhibit Data EEPROM read operations.
Bit 0
RD: EEPROM read control
0: read cycle has finished
1: activate a read cycle
This is the Data EEPROM Read Control Bit and when set high by the application program will
activate a read cycle. This bit will be automatically reset to zero by the hardware after the read
cycle has finished. Setting this bit high will have no effect if the RDEN has not first been set high.
Note: The WREN, WR, RDEN and RD can not be set to ²1² at the same time in one instruction. The WR and RD can
not be set to ²1² at the same time.
Rev. 1.00
29
February 1, 2011