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| 型號(hào)： | SZF2002HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | Low voltage 8-bit microcontroller with 6-kbyte embedded RAM |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, SOT-315-1, LQFP-80 |
| 文件頁(yè)數(shù)： | 23/76頁(yè) |
| 文件大小： | 431K |
| 代理商： | SZF2002HL |
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1998 Aug 26
23
Philips Semiconductors
Product specification
Low voltage 8-bit microcontroller with
6-kbyte embedded RAM
SZF2002
13 PULSE WIDTH MODULATED OUTPUT
One Pulse Width Modulated output channel PWM is
provided which outputs pulses of programmable length
and interval. The repetition frequency is defined by an 8-bit
prescaler (PWMP) that generates the clock for the
counter. The 8-bit counter counts modulo 255, i.e. from
0 to 254 inclusive. The value held in the 8-bit counter is
compared to the contents of the register PWM. If a new
prescaler value is written in register PWMP the 8-bit
counter finishes uninterrupted, and the new prescaler
value is used in the next count cycle.
Provided the contents of this register are greater than the
counter value, the PWM output is set HIGH. If the contents
of register PWMP are equal to, or less than the counter
value, the PWM output is set LOW.
The pulse-width-ratio is therefore defined by the contents
of register PWM. The pulse-width-ratio will be in the range
0 to
255
255
and may be programmed in increments of
1
255
.
The repetition frequency (f
PWM
) at the PWM output is given
by:
For f
clk
= 12 MHz, the above formula gives a repetition
frequency range of 92 Hz to 23.5 kHz.
By loading the PWM register with either 00H or FFH, the
PWM output can be retained at a constant LOW or HIGH
level respectively. When loading FFH into the PWM
register, the 8-bit counter will never actually reach this
value.
The PWM output pin is not shared with any other function.
f
PWM
f
PWMP
)
255
×
+
2
×
--1
=
Fig.12 Functional diagram of Pulse Width Modulated output (PWM).
handbook, full pagewidth
MGM140
I
N
T
E
R
N
A
L
B
U
S
fclk
PWMP
+
DIVIDE-BY-2
8-BIT COUNTER
PWM
8-BIT COMPARATOR
OUTPUT
BUFFER
PWM
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