pca82c200t NXP Semiconductors, pca82c200t Datasheet - Page 17
pca82c200t
Manufacturer Part Number
pca82c200t
Description
8-bit Microcontroller With On-chip Can
Manufacturer
NXP Semiconductors
Datasheet
1.PCA82C200T.pdf
(108 pages)
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Philips Semiconductors
Notes to the Alternative Port functions
1. Port lines P1.6 and P1.7 may be selected as CTX0 and CTX1 outputs of the serial port SIO1 (CAN).
2. Unused analog inputs can be used as digital inputs. As Port 5 lines may be used as inputs to the ADC, these digital
9
Two Pulse Width Modulated (PWM) output channels are
available with the P8xCE598. These channels provide
output pulses of programmable length and interval.
The repetition frequency is defined by an 8-bit prescaler
PWMP which generates the clock for the counter.
Both the prescaler and counter are common to both PWM
channels. The 8-bit counter counts modulo 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 output of PWM0 or PWM1 is
set LOW. If the contents of these register 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 register PWM0 and PWM1. The pulse-width-ratio is in
the range of 0 to
increments of
1996 Jun 27
handbook, full pagewidth
8-bit microcontroller with on-chip CAN
After reset P1.6 and P1.7 may be used as normal I/O ports, if the CAN interface is not used.
inputs have an inherent hysteresis to prevent the input logic from drawing too much current from the power lines
when driven by analog signals.
Channel-to-channel crosstalk should be taken into consideration when both digital and analog signals are
simultaneously input to Port 5 (see Chapter 20).
PULSE WIDTH MODULATED OUTPUTS (PWM)
from port latch
read port pin
1
input data
255
255
.
255
Q
and may be programmed in
Fig.8 I/O buffers in the P8xCE598 (P1.0 to P1.5, Ports 2, 3, and 4).
2 oscillator
periods
BUFFER
INPUT
strong pull-up
17
The repetition frequency f
given by:
When using an oscillator frequency of 16 MHz, for
example, the above formula would give a repetition
frequency range of 123 Hz to 31.4 kHz.
By loading the PWM registers with either 00H or FFH, the
PWM outputs can be retained at a constant HIGH or LOW
level respectively. When loading FFH to the PWM
registers, the 8-bit counter will never actually reach this
(FFH) value.
Both output pins PWMn are driven by push-pull drivers,
and are not shared with any other function.
p1
n
f
PWM
p2
=
------------------------------------------------------------- -
2
I1
PWMP
PWM
p3
f
CLK
, at the PWMn outputs is
+
1
1, 2, 3 or 4
Product specification
+5 V
I/O PIN
PORT
255
P8xCE598
MGA153
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