參數(shù)資料
型號(hào)： X9279
英文描述： IC,FLASH MEMORY,64 MB,120NS,3.0V,48 TSOP
中文描述： 單數(shù)字控制（數(shù)字電位器）電位
文件頁(yè)數(shù)： 10/24頁(yè)
文件大小： 398K
代理商： X9279
X9279
Characteristics subject to change without notice.
10 of 24
REV 1.1.7 2/6/03
www.xicor.com
Table 4. Wiper counter Register, WCR (8-bit), WCR[7:0]:
Used to store the current wiper position (Volatile, V).
WCR7
WCR6
WCR5
WCR4
V
V
V
V
(MSB)
Table 5. Data Register, DR (8-bit), Bit [7:0]:
Used to store wiper positions or data (Nonvolatile, NV).
Bit 7
Bit 6
Bit 5
Bit 4
NV
NV
NV
NV
MSB
WCR3
V
WCR2
V
WCR1
V
WCR0
V
(LSB)
Bit 3
NV
Bit 2
NV
Bit 1
NV
Bit 0
NV
LSB
Instructions
Four of the seven instructions are three bytes in length.
These instructions are:
–
Read Wiper Counter Register
– read the current
wiper position of the potentiometer,
–
Write Wiper Counter Register
– change current
wiper position of the potentiometer,
–
Read Data Register
– read the contents of the
selected Data Register;
–
Write Data Register
– write a new value to the
selected Data Register.
The basic sequence of the three byte instructions is
illustrated in Figure 4. These three-byte instructions
exchange data between the WCR and one of the Data
Registers. A transfer from a Data Register to a WCR is
essentially a write to a static RAM, with the static RAM
controlling the wiper position. The response of the
wiper to this action will be delayed by t
WRL
. A transfer
from the WCR (current wiper position), to a Data
Register is a write to nonvolatile memory and takes a
minimum of t
WR
to complete. The transfer can occur
between the potentiometer and one of its four
associated registers (Bank 0).
Two instructions require a two-byte sequence to
complete. These instructions transfer data between the
host and the X9279; either between the host and one
of the data registers or directly between the host and
the Wiper Counter Register. These instructions are:
–
XFR Data Register to Wiper Counter Register
–
This transfers the contents of one specified Data
Register to the Wiper Counter Register.
–
XFR Wiper Counter Register to Data Register
–
This transfers the contents of the Wiper Counter
Register to the specified Data Register.
The final command is Increment/Decrement (Figure 5
and 6). The Increment/Decrement command is
different from the other commands. Once the
command is issued and the X9279 has responded with
an acknowledge, the master can clock the selected
wiper up and/or down in one segment steps; thereby,
providing a fine tuning capability to the host. For each
SCL clock pulse (t
HIGH
) while SDA is HIGH, the
selected wiper will move one resistor segment towards
the R
H
terminal. Similarly, for each SCL clock pulse
while SDA is LOW, the selected wiper will move one
resistor segment towards the R
L
terminal.
See Instruction format for more details.
Figure 3. Two-Byte Instruction Sequence
These commands only valid when P1=P0=0
S
T
A
R
T
0
1
0
1
0 A2
A0
A
C
K
I3
I2
I1 I0
RB RA P1
A
C
K
SCL
SDA
S
T
O
P
0
0
ID3 ID2 ID1 ID0
P0
Device ID
Internal
Address
Instruction
Opcode
Register
Address
Pot/Bank
Address
A1
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