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| 型号： | P83C880 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Microcontrollers for monitors with DDC interface, auto-sync detection and sync proc(带DDC接口，同步监测和同步处理的监视器微控制器) |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42 |
| 文件页数： | 33/84页 |
| 文件大小： | 420K |
| 代理商： | P83C880 |
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1997 Dec 12
33
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
14.2.1
C
OARSE ADJUSTMENT
An active HIGH pulse is generated in every subperiod; the
pulse width being determined by the contents of PWM10H.
The coarse output (OUT1) is HIGH at the start of each
subperiod and will remain HIGH until the time
[4/f
clk
×
(128
PWM10H)] has elapsed. The output will
then go LOW and remain LOW until the start of the next
subperiod. The coarse pulse width may be calculated as:
14.2.2
F
INE ADJUSTMENT
Fine adjustment is achieved by generating an additional
pulse in specific subperiods. The pulse is added at the
start of the selected subperiod and has a pulse width of
4/f
clk
. The contents of PWM10L determine in which
subperiods a fine pulse will be added. It is the logic 0 state
of the value held in PWM10L that actually selects the
subperiods. When more than one bit is a logic 1 then the
subperiods selected will be a combination of those
subperiods specified in Table 30.
Pulse duration
PWM10H
(
)
f
clk
-4
×
=
For example, if PWM10L = 000 0101 then this is a
combination of:
PWM10L = 000 0001: subperiod 64
PWM10L = 000 0100: subperiods 16, 48, 80 and 112.
Pulses will be added in subperiods 16, 48, 64, 80 and 112.
This example is illustrated in Fig.18.
When PWM10L holds 000 0000 fine adjustment is
inhibited and the PWM10 output is determined only by the
contents of PWM10H.
Table 30
Additional pulse distribution
PWM10L
ADDITIONAL PULSE IN SUBPERIOD
000 000
1
000 0010
000 0100
000 1000
001 0000
010 0000
100 0000
64
32 and 96
16, 48, 80 and 112
8, 24, 40, 56, 72, 88, 104 and 120
4, 12, 20, 28, 36, 44, 52...116 and 124
2, 6, 10, 14, 18, 22, 26, 30...122 and 126
1, 3, 5, 7, 9, 11, 13, 15, 17...125 and 127
Fig.16 PWM10 output patterns: Coarse adjustment only.
handbook, full pagewidth
4
127
0
1
2
128
(m
+
1)
128
(m
1)
128
m
127
0
1
00
01
m
127
decimal value PWM7H data latch
MGG045
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