參數(shù)資料
型號(hào): X9119
英文描述: CLAMP
中文描述: 單數(shù)字控制電位器
文件頁數(shù): 9/23頁
文件大?。?/td> 131K
代理商: X9119
X9119
– Preliminary Information
Characteristics subject to change without notice.
9 of 22
REV 1.1.11 3/12/02
www.xicor.com
Table 4. Wiper Control Register, WCR (10-bit), WCR9–WCR0:
Used to store the current wiper position (Volatile, V)
Table 5. Data Register, DR (10-bit), Bit 9–Bit 0:
Used to store wiper positions or data (Non-Volatile, NV)
WCR9
V
(MSB)
WCR8
V
WCR7
V
WCR6
V
WCR5
V
WCR4
V
WCR3
V
WCR2
V
WCR1
V
WCR0
V
(LSB)
Bit 9
NV
MSB
Bit 8
NV
Bit 7
NV
Bit 6
NV
Bit 5
NV
Bit 4
NV
Bit 3
NV
Bit 2
NV
Bit 1
NV
Bit 0
NV
LSB
Four of the six instructions are four bytes in length.
These instructions are:
Read Wiper Counter Register
– read the current
wiper position of the selected potentiometer,
Write Wiper Counter Register
– change current
wiper position of the selected 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 four byte instructions is
illustrated in Figure 3. These four-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 one of the four potentiometers and one of its
associated registers.
Two instructions (see Figure 4) require a two-byte
sequence to complete. These instructions transfer data
between the host and the X9119; 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.
See Instruction format for more details.
P
OWER
U
P
AND
D
OWN
R
EQUIREMENTS
There are no restrictions on the power-up condition of
Vcc and the voltages applied to the potentiometer pins
provided that the Vcc is always more positive than or
equal to the voltages at R
H
, R
L
, and R
W
, i.e. V
CC
R
H
,
R
L
, R
W
. There are no restrictions on the power-down
condition. However, the datasheet parameters for the
DCP do not apply until 1milisecond after V
CC
reaches
its final value.
Figure 3. Two-Byte Instruction Sequence
S
T
A
R
T
0
1
0
1
A2
A1
A0 R/W
A
C
K
I2
I1
I0
0
RB RA 0
A
C
K
SCL
SDA
S
T
O
P
0
0
0
ID3 ID2 ID1 ID0
Device ID
Internal
Address
Instruction
Opcode
Register
Address
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