IC MCU OTP 512X12 18DIP

 

PIC16C54C-04I/P

Manufacturer Part NumberPIC16C54C-04I/P
DescriptionIC MCU OTP 512X12 18DIP
ManufacturerMicrochip Technology
SeriesPIC® 16C
PIC16C54C-04I/P datasheets

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Specifications of PIC16C54C-04I/P

Program Memory TypeOTPProgram Memory Size768B (512 x 12)
Package / Case18-DIP (0.300", 7.62mm)Core ProcessorPIC
Core Size8-BitSpeed4MHz
PeripheralsPOR, WDTNumber Of I /o12
Ram Size25 x 8Voltage - Supply (vcc/vdd)3 V ~ 5.5 V
Oscillator TypeExternalOperating Temperature-40°C ~ 85°C
Processor SeriesPIC16CCorePIC
Data Bus Width8 bitData Ram Size25 B
Maximum Clock Frequency4 MHzNumber Of Programmable I/os12
Number Of Timers1Operating Supply Voltage2.5 V to 5.5 V
Maximum Operating Temperature+ 85 CMounting StyleThrough Hole
3rd Party Development Tools52715-96, 52716-328, 52717-734Development Tools By SupplierICE2000
Minimum Operating Temperature- 40 CLead Free Status / RoHS StatusLead free / RoHS Compliant
For Use With309-1059 - ADAPTER 18 ZIF BD W/18SO PLUGSDVA16XP180 - ADAPTER DEVICE FOR MPLAB-ICEAC164001 - MODULE SKT PROMATEII 18/28DIPEeprom Size-
Data Converters-Connectivity-
show all specifications
PIC16LC58B-04P PDF datasheetPIC16C54C-04IP PDF datasheet #2
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Page 41/194

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8.1
Using Timer0 with an External
Clock
When an external clock input is used for Timer0, it must
meet certain requirements. The external clock require-
ment is due to internal phase clock (T
OSC
tion. Also, there is a delay in the actual incrementing of
Timer0 after synchronization.
8.1.1
EXTERNAL CLOCK
SYNCHRONIZATION
When no prescaler is used, the external clock input is
the same as the prescaler output. The synchronization
of T0CKI with the internal phase clocks is accom-
plished by sampling the prescaler output on the Q2 and
Q4 cycles of the internal phase clocks (Figure 8-5).
Therefore, it is necessary for T0CKI to be high for at
least 2T
(and a small RC delay of 20 ns) and low for
OSC
at least 2T
(and a small RC delay of 20 ns). Refer
OSC
to the electrical specification of the desired device.
FIGURE 8-5:
TIMER0 TIMING WITH EXTERNAL CLOCK
External Clock Input or
Prescaler Output (1)
External Clock/Prescaler
Output After Sampling
Increment Timer0 (Q4)
Timer0
Note 1: External clock if no prescaler selected, prescaler output otherwise.
2: The arrows indicate the points in time where sampling occurs.
3: Delay from clock input change to Timer0 increment is 3Tosc to 7Tosc (duration of Q = Tosc). Therefore,
the error in measuring the interval between two edges on Timer0 input =
2002 Microchip Technology Inc.
When a prescaler is used, the external clock input is
divided by the asynchronous ripple counter-type pres-
caler so that the prescaler output is symmetrical. For
the external clock to meet the sampling requirement,
the ripple counter must be taken into account. There-
) synchroniza-
fore, it is necessary for T0CKI to have a period of at
least 4T
(and a small RC delay of 40 ns) divided by
OSC
the prescaler value. The only requirement on T0CKI
high and low time is that they do not violate the mini-
mum pulse width requirement of 10 ns. Refer to param-
eters 40, 41 and 42 in the electrical specification of the
desired device.
8.1.2
TIMER0 INCREMENT DELAY
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 Timer0 mod-
ule is actually incremented. Figure 8-5 shows the delay
from the external clock edge to the timer incrementing.
Q1 Q2 Q3 Q4
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
(3)
(2)
T0
Preliminary
PIC16C5X
Small pulse
misses sampling
T0 + 1
T0 + 2
4Tosc max.
DS30453D-page 39

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