參數(shù)資料
型號： P87C380
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Microcontrollers for monitors with DDC interface, auto-sync detection and sync proc(帶DDC接口，同步監(jiān)測和同步處理的監(jiān)視器微控制器)
中文描述： 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42
文件頁數(shù)： 52/84頁
文件大小： 420K
代理商： P87C380
1997 Dec 12
52
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
19.1.2
H
ORIZONTAL
P
ERIOD
C
OUNTING
H
IGH
-
BYTE
R
EGISTER
(HFHIGH)
Table 45
Horizontal Period Counting High-byte Register (SFR address FCH)
Table 46
Description of HFHIGH bits
19.1.3
V
ERTICAL
P
ERIOD
C
OUNTING
H
IGH
-
BYTE
R
EGISTER
(VFHIGH)
Table 47
Vertical Period Counting High-byte Register (SFR address FDH)
Table 48
Description of VFHIGH bits
19.1.4
V
ERTICAL AND
H
ORIZONTAL
P
ERIOD
C
OUNTING
L
OW
-
NIBBLES
R
EGISTER
(VFLHFL)
Table 49
Register containing the low nibbles of the Horizontal and Vertical Period Counting (SFR address FEH)
Table 50
Description of VFLHFL bits
2
Vpres
Indicates the presence of VSYNC. If Vpres = 1, VSYNC is present. If Vpres = 0, VSYNC
is not present.
Indicates the polarity of HSYNC. If Hpol = 0, polarity is positive (active HIGH; i.e. HIGH
at horizontal retracing period). If Hpol = 1, polarity is negative (active LOW; i.e. LOW at
horizontal retracing period).
Indicates the polarity of VSYNC. If Vpol = 0, polarity is positive (active HIGH; i.e. HIGH
at vertical retracing period). If Hpol = 1, polarity is negative (active LOW; i.e. LOW at
vertical retracing period).
1
Hpol
0
Vpol
7
6
5
4
3
2
1
0
HF.11
HF.10
HF.9
HF.8
HF.7
HF.6
HF.5
HF.4
BIT
SYMBOL
DESCRIPTION
7 to 0
HF.11 to HF.4
Indicate the high byte of the value counted by mode detector for 4
horizontal scanning periods.
7
6
5
4
3
2
1
0
VF.11
VF.10
VF.9
VF.8
VF.7
VF.6
VF.5
VF.4
BIT
SYMBOL
DESCRIPTION
7 to 0
VF.11 to VF.4
Indicate the high byte of the value counted by mode detector for 1
vertical field/frame period.
7
6
5
4
3
2
1
0
VF.3
VF.2
VF.1
VF.0
HF.3
HF.2
HF.1
HF.0
BIT
SYMBOL
DESCRIPTION
7 to 4
VF.3 to VF.0
Indicate the low nibble of the value counted by mode detector for 1 vertical field/frame
period.
Indicate the low nibble of the value counted by mode detector for 4 horizontal scanning
periods.
3 to 0
HF.3 to HF.0
BIT
SYMBOL
DESCRIPTION
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