參數(shù)資料
型號(hào)： PCA84C646
廠商： NXP Semiconductors N.V.
英文描述： Microcontrollers for TV tuning control and OSD applications(應(yīng)用于TV調(diào)頻和OSD的微控制器)
中文描述： 微控制器的控制和調(diào)整（應(yīng)用于電視調(diào)頻和OSD的微控制器應(yīng)用的電視OSD）
文件頁(yè)數(shù)： 14/72頁(yè)
文件大?。?/td> 564K
代理商： PCA84C646
1995 Jun 15
14
Philips Semiconductors
Preliminary specification
Microcontrollers for TV tuning
control and OSD applications
PCA84C646; PCA84C846
8
AFC INPUT
The AFC input is intended to measure the level of the
Automatic Frequency Control (AFC) signal. This is done
by comparing the AFC signal with the output of a 4-bit
digital-to-analog converter as shown in Fig.11. The DAC
analog switches select one of the 16 resistor taps that are
connected between V
DD
and V
SS
(controlled by bits
AFCV3, AFCV2, AFCV1, AFCV0; Derivative Register 20).
The AFCC signal (bit 0 in Derivative Register 20) then can
be tested to check whether the AFC input is higher or lower
than the DAC level.
The AFC inputs AFC0, AFC1 and AFC2 share the same
pins as Derivative Port lines DP10, DP11 and DP12. The
pin functions are selected by bits AFCE0, AFCE1, AFCE2
(AFC enable/disable bits; Derivative Register 22); for
selection see Table 6.
AFCH1 and AFCH0 (Derivative Register 20) select one
out of three AFC inputs to the comparator; for a correct
comparison, enable the corresponding AFC input (AFCi)
as shown in Table 7.
The conversion time of the AFC is greater than 6
μ
s but
less than 9
μ
s. It is recommended to add a NOP instruction
between the instruction which changes V
ref
or channel
selection and the instruction which reads the AFCC bit
(compare bit).
If the compare bit:
AFCC = 0, then the AFC voltage < V
ref
.
AFCC = 1, then the AFC voltage > V
ref
.
Table 6
Selection of pin function DP1i/AFCi (i = 0, 1, 2)
Table 7
AFC input selection
BIT
VALUE
PIN FUNCTION
COMPARATOR
AFCE2
1
0
1
0
1
0
DP12
AFC2
DP11
AFC1
DP10
AFC0
disabled
enabled
disabled
enabled
disabled
enabled
AFCE1
AFCE0
AFCH1 AFCH0
SELECT
0
0
1
1
0
1
0
1
AFC Channel 0; AFC0
AFC Channel 1; AFC1
AFC Channel 2; AFC2
reserved
Fig.11 AFC circuit.
handbook, full pagewidth
4-BIT D/A
COMPARATOR
EN
AFCV3
AFCV2
AFCV1
AFCV0
AFCE0
AFCE1
AFCE2
AFCH1
AFCH0
MED185
AFC function enable
selection
AFC value selection
ENABLE
SELECTOR
AFC
ANALOG
SELECTOR
DP12/AFC2
DP11/AFC1
DP10/AFC0
(DP10 to DP12)
EN1
EN2
EN0
‘MOV A, D20’
instruction
to read AFCCx bit
Internal bus
Channel selection
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