參數(shù)資料
型號: SAA7392
廠商: NXP Semiconductors N.V.
英文描述: Channel encoder/decoder CDR60(通道編碼器/譯碼器)
中文描述: 信道編碼器/解碼器CDR60(通道編碼器/譯碼器)
文件頁數(shù): 45/76頁
文件大小: 246K
代理商: SAA7392
2000 Mar 21
45
Philips Semiconductors
Preliminary specification
Channel encoder/decoder CDR60
SAA7392
7.10.9
T
ACHO
C
ONTROL
R
EGISTER
3 (T
ACHO
3)
Table 88
Tacho Control Register 3 (address 19H) - WRITE
Table 89
Description of Tacho3 bits
Table 90
Motor servo frequency source selection
7
6
5
4
3
2
1
0
SConS.1
SConS.0
TachoFRes
Moto2/T3
Fsam.1
Fsam.0
TachoIntLF
TachoMode
BIT
SYMBOL
DESCRIPTION
7
6
5
SConS.1
SConS.0
TachoFRes
These 2 bits select the motor servo frequency source; see Table 90.
If TachoFRes = 0, then the tacho filter is enabled (normal mode). If TachoFRes = 1, then
the tacho filter is reset.
If Moto2/T3 = 0, then MOTO2 pin is an output. If Moto2/T3 = 1, then MOTO2 pin is
tacho T3.
These 2 bits select the tacho sample rate (f
s
) as shown below:
4
Moto2/T3
3
2
Fsam.1
Fsam.0
1
TachoIntLF
If TacholntLF = 0, then tacho interrupt is enabled on frequencies LOWER than set-point.
If TacholntLF = 1, then tacho interrupt is enabled on frequencies HIGHER than
set-point.
If TachoMode = 0, tacho is in 3-pin mode. If TachoMode = 1, tacho is in 1-pin mode.
0
TachoMode
SConS.1
SConS.0
MOTOR SERVO FREQUENCY SOURCE
0
0
1
1
0
1
0
1
Motor servo locks to PLL clock (recovered from channel EFM).
This value is reserved.
Motor servo runs on tacho frequency.
This value is reserved.
f
s
Hz
(
)
2
2
Fsam<1:0>
×
system clock
32768
×
=
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