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參數(shù)資料
| 型號： | PCE84C882 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontroller for monitor OSD and auto-sync applications(監(jiān)視器屏幕顯示和自動同步應(yīng)用的微控制器) |
| 中文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, PLASTIC, SDIP-42 |
| 文件頁數(shù)： | 11/60頁 |
| 文件大?。?/td> | 409K |
| 代理商： | PCE84C882 |
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1996 Jan 08
11
Philips Semiconductors
Preliminary specification
Microcontroller for monitor OSD
and auto-sync applications
PCE84C882
7.2
14-bit PWM output
PWM8 shares the same pin as Derivative Port line DP13.
Selection of the pin function as either a PWM output or as
a Derivative Port line is achieved using the PWM8E bit in
Register 22 (see Section 12.1).
The block diagram for the 14-bit PWM output is shown in
Fig.7 and comprises:
Two 7-bit latches: PWM8L (Register 18) and PWM8H
(Register 19)
14-bit data latch (PWMREG)
14-bit counter
Coarse pulse controller
Fine pulse controller
Mixer.
Data is loaded into the 14-bit data latch (PWMREG) from
the two 7-bit data latches (PWM8H and PWM8L) when
either of these data latches is written to. The upper seven
bits of PWMREG are used by the coarse pulse controller
and determine the coarse pulse width; the lower seven bits
are used by the fine pulse controller and determine in
which subperiods fine pulses will be added. The outputs
OUT1 and OUT2 of the coarse and fine pulse controllers
are ‘ORED’ in the mixer to give the PWM8 output. The
polarity of the PWM8 output is programmable and is
selected by the P8LVL bit in Register 23, this is described
in Section 12.2.
As the 14-bit counter is clocked by
1
3
×
f
xtal
, the repetition
times of the coarse and fine pulse controllers may be
calculated as shown below.
Coarse controller repetition time:
Fine controller repetition time:
Figure 8 shows typical PWM8 outputs, with coarse
adjustment only, for different values held in PWM8H.
Figure 9 shows typical PWM8 outputs, with coarse and
fine adjustment, after the coarse and fine pulse controller
outputs have been ‘ORED’ by the mixer.
t
sub
f
xtal
384
=
t
r
f
xtal
49152
=
7.2.1
C
OARSE ADJUSTMENT
An active HIGH pulse is generated in every subperiod; the
pulse width being determined by the contents of PWM8H.
The coarse output (OUT1) is LOW at the start of each
subperiod and will remain LOW until the time
has elapsed. The output will
3 f
xtal
PWM8H
1
+
then go HIGH and remain HIGH until the start of the next
subperiod. The coarse pulse width may be calculated as
shown below.
7.2.2
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
3/f
xtal
. The contents of PWM8L determine in which
subperiods a fine pulse will be added. It is the logic 0 state
of the value held in PWM8L that actually selects the
subperiods. When more than one bit is a logic 0 then the
subperiods selected will be a combination of those
subperiods specified in Table 3. For example, if
PWM8L = 111 1010 then this is a combination of:
PWM8L = 111 1110: subperiod 64 and
PWM8L = 111 1011: subperiods 16, 48, 80 and 112.
Pulses will be added in subperiods 16, 48, 64, 80 and 112.
This example is illustrated in Fig.10.
When PWM8L holds 111 1111 fine adjustment is inhibited
and the PWM8 output is determined only by the contents
of PWM8H.
Table 3
Additional pulse distribution
PWM8L
ADDITIONAL PULSE IN SUBPERIOD
111 111
0
111 11
0
1
111 1
0
11
111
0
111
11
0
1111
1
0
1 1111
0
11 1111
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
(
)
×
[
]
Pulse duration
127
PWM8H
–
(
)
xtal
f
×
=
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