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參數(shù)資料
| 型號： | TMC22071AR1C |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Phono Plug; Leaded Process Compatible:Yes; Gender:Male; Number of Contacts:3 |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 125K |
| 代理商： | TMC22071AR1C |
PRODUCT SPECIFICATION
TMC22071A
7
Control and Status Registers
The TMC22071A is controlled by a single 47-bit long Con-
trol Register. Access to the Control Register is via the I/O
Port Shift Register arranged as shown in Figure 1. The Con-
trol Register can be written, with the desired programming.
The 12-bit Status Register is read-only and accessed through
the same l/O Port Shift Register. Reading the Status Register
yields information about blanking level, subcarrier presence,
and whether or not PXCK is locked or unlocked with respect
to the line rate.
Figure 1. Control and Shift Register Structure
The host processor writes data into the TMC22071A using
only one bit of the microprocessor’s data and address bus. As
shown in Figure 2, the user should bring A
0
high for the CS
falling edge preceding the introduction of bit 0 to the D
0
port. The next rising edge of CS completes the preloading of
the control data, which transfer into the control register on
the next rising edge of the pixel clock. The I/O Port Shift
Register, Control Register and Status Register are governed
by CS, R/W, and A
0
. R/W and A
0
are latched by the
TMC22071A on the falling edge of CS and data input D
0
is
latched on the rising edge of CS. Data read from D
0
is
enabled by the falling edge of CS and disabled by the rising
edge of CS. When the Control Register is read more than
once consecutively, an extra CS pulse and accompanying A
0
is needed to align the circulated shift register data.
I/O Port Shift Register
65-22071-03
Control Register
Status
Register
D0
0
46
47
58
Table 1. Microprocessor Port Control
The full sequence of 47 bits of Control Register data must be
written each time a change in that data is desired. All or a
few of the Control and Status Register bits may be read,
but the sequence always begins with bit 58 of the Status
Register.
Figure 2. Data Write Sequence
Figure 3. Data Read Sequence
A
0
0
R/W
0
Action
Write data from D
0
into l/O Port Shift
Register
Read D
0
data from last stage of l/O
Port Shift Register
Transfer l/O Port Shift Register
contents to Control Register
Enables continuous update of status
bits in l/O Port Shift Register
0
1
1
0
1
1
CS
R/W
D0
tH
tS
A0
46
45
1
0
65-22071-04
CS
R/W
D0
A0
58
57
1
0
65-22071A-05
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