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| 型号： | P80CE558EBB |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Single-chip 8-bit microcontroller |
| 中文描述： | 8-BIT, 16 MHz, MICROCONTROLLER, PQFP80 |
| 文件页数： | 15/72页 |
| 文件大小： | 721K |
| 代理商： | P80CE558EBB |
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Philips Semiconductors
Preliminary specification
P83CE558/P80CE558/P89CE558
Single-chip 8-bit microcontroller
1996 Aug 06
15
6.5
The P8xCE558 contains two pulse width modulated output channels
(see Figure 13). These channels generate pulses of programmable
length and interval. The repetition frequency is defined by an 8-bit
prescaler PWMP, which supplies the clock for the counter. The
prescaler and counter are common to both PWM channels. The 8-bit
counter counts module 255, i.e., from 0 to 254 inclusive. The value
of the 8-bit counter is compared to the contents of two registers:
PWM0 and PWM1. Provided the contents of either of these registers
is greater than the counter value, the corresponding PWM0 or
PWM1 output is set LOW. If the contents of these registers are
equal to, or less than the counter value, the output will be HIGH. The
pulse-width-ratio is therefore defined by the contents of the registers
PWM0 and PWM1. The pulse-width-ratio is in the range of 0/255 to
255/255 and may be programmed in increments of 1/255.
Pulse Width Modulated Outputs
Buffered PWM outputs may be used to drive DC motors. The
rotation speed of the motor would be proportional to the contents of
PWMn. The PWM outputs may also be configured as a dual DAC. In
this application, the PWM outputs must be integrated using
conventional operational amplifier circuitry. If the resulting output
voltages have to be accurate, external buffers with their own analog
supply should be used to buffer the PWM outputs before they are
integrated. The repetition frequency fpwm, at the PWMn outputs is
give by:
fpwm
f
CLK
PWMP)
2
(1
255
This gives a repetition frequency range of 123 Hz to 31.4 kHz (f
CLK
= 16 MHz). By loading the PWM registers with either 00H or FFH,
the PWM channels will output a constant HIGH or LOW level,
respectively. Since the 8-bit counter counts modulo 255, it can never
actually reach the value of the PWM registers when they are loaded
with FFH.
When a compare register (PWM0 or PWM1) is loaded with a new
value, the associated output is updated immediately. It does not
have to wait until the end of the current counter period. Both PWMn
output pins are driven by push-pull drivers. These pins are not used
for any other purpose.
PWMP (FEH)
PWMP.7
PWMP.6
PWMP.5
PWMP.4
PWMP.3
PWMP.2
PWMP.1
PWMP.0
Figure 10. Prescaler frequency control register PWMP.
7
6
5
4
3
2
1
0
Table 6.
Description of PWMP Bits
BIT
FUNCTION
PWMP.0 to 7
Prescaler division factor = (PWMP) + 1
NOTE:
1. Reading PWMP gives the current reload value. The actual count of the prescaler cannot be read.
PWM0 (FCH)
PWM0.7
PWM0.6
PWM0.5
PWM0.4
PWM0.3
PWM0.2
PWM0.1
PWM0.0
Figure 11. Pulse width register PWM0.
7
6
5
4
3
2
1
0
Table 7.
Description of PWM0 bits
BIT
FUNCTION
PWM0.0 to 7
LOW/HIGH ration of PWM0 signal =
(PWM0)
255 – (PWM0)
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PDF描述 |
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| P80CE558EFB | Single-chip 8-bit microcontroller |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| P80CE558EFB | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P80CE559 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P80CE559EBB | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P80CE559EFB | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P80CE560 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontroller |
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