PIC16C432-E/SS Microchip Technology, PIC16C432-E/SS Datasheet - Page 31

• Manufacturer Part Number: PIC16C432-E/SS
• Description: IC MCU CMOS 8BIT 20MHZ 2K 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C432-E/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: LIN (Local Interconnect Network)
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SSOP
• For Use With: XLT20SS-1 - SOCKET TRANSITION 18DIP 20SSOPAC164307 - MODULE SKT FOR PM3 28SSOPAC164029 - MODULE SKT PROMATEII 20DIP/SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

6.2
When an external clock input is used for Timer0, it must
meet certain requirements. The external clock
requirement is due to internal phase clock (T
synchronization. Also, there is a delay in the actual
incrementing of Timer0 after synchronization.
6.2.1
When no prescaler is used, the external clock input is
the same as the prescaler output. The synchronization
of
accomplished by sampling the prescaler output on the
Q2 and Q4 cycles of the internal phase clocks
(Figure 6-5). Therefore, it is necessary for T0CKI to be
high for at least 2T
and low for at least 2T
20 ns). Refer to the electrical specification of the
desired device.
FIGURE 6-5:
2002 Microchip Technology Inc.
T0CKI
Note 1: Delay from clock input change to Timer0 increment is 3T
External Clock/Prescaler
Output after Sampling
External Clock Input or
Prescaler Output
Using Timer0 with External Clock
Increment Timer0 (Q4)
EXTERNAL CLOCK
SYNCHRONIZATION
with
2: External clock if no prescaler selected, prescaler output otherwise.
3: The arrows indicate the points in time where sampling occurs.
fore, the error in measuring the interval between two edges on Timer0 input = ±4 T
OSC
the
TIMER0 TIMING WITH EXTERNAL CLOCK
(and a small RC delay of 20 ns)
OSC
(2)
Timer0
internal
(and a small RC delay of
Q1 Q2 Q3 Q4
(3)
phase
clocks
(1)
OSC
Preliminary
Q1 Q2 Q3 Q4
is
T0
)
When a prescaler is used, the external clock input is
divided by the asynchronous ripple-counter type
prescaler, so that the prescaler output is symmetrical.
For the external clock to meet the sampling
requirement, the ripple-counter must be taken into
account. Therefore, it is necessary for T0CKI to have a
period of at least 4T
40 ns), divided by the prescaler value. The only
requirement on T0CKI high and low time is that they do
not violate the minimum pulse width requirement of
10 ns. Refer to parameters 40, 41 and 42 in the
electrical specification of the desired device.
6.2.2
Since the prescaler output is synchronized with the
internal clocks, there is a small delay from the time the
external clock edge occurs to the time the TMR0 is
actually incremented. Figure 6-5 shows the delay from
the external clock edge to the timer incrementing.
OSC
Q1 Q2 Q3 Q4
to 7T
T0 + 1
TIMER0 INCREMENT DELAY
OSC
(Duration of Q = T
OSC
Q1 Q2 Q3 Q4
PIC16C432
OSC
(and a small RC delay of
T0 + 2
max.
Small pulse
misses sampling
OSC
). There-
DS41140B-page 29