PIC16C64A-10/P Microchip Technology, PIC16C64A-10/P Datasheet - Page 43
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PIC16C64A-10/P
Manufacturer Part Number
PIC16C64A-10/P
Description
IC MCU OTP 2KX14 PWM 40DIP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F818-ISO.pdf
(6 pages)
3.PIC16LC62A-04SP.pdf
(337 pages)
4.PIC16C64A-04P.pdf
(8 pages)
5.PIC16C64A-10P.pdf
(137 pages)
Specifications of PIC16C64A-10/P
Core Size
8-Bit
Program Memory Size
3.5KB (2K x 14)
Oscillator Type
External
Core Processor
PIC
Speed
10MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Type
OTP
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 6 V
Operating Temperature
0°C ~ 70°C
Package / Case
40-DIP (0.600", 15.24mm)
Controller Family/series
PIC16C
No. Of I/o's
33
Ram Memory Size
128Byte
Cpu Speed
10MHz
No. Of Timers
3
No. Of Pwm
RoHS Compliant
Rohs Compliant
Yes
Embedded Interface Type
I2C, SPI
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16C64A-10/PQ
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
PIC16C64A-10/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
6.2
When an external clock input is used for Timer0, it must
meet certain requirements. The requirements ensure
the external clock can be synchronized with the internal
phase clock (T
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 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 6-5).
Therefore, it is necessary for T0CKI to be high for at
least 2Tosc (and a small RC delay of 20 ns) and low for
at least 2Tosc (and a small RC delay of 20 ns). Refer to
the electrical specification of the desired device.
FIGURE 6-5:
1996 Microchip Technology Inc.
Note 1: Delay from clock input change to Timer0 increment is 3Tosc to 7Tosc. (Duration of Q = Tosc).
Using Timer0 with External Clock
EXTERNAL CLOCK SYNCHRONIZATION
2: External clock if no prescaler selected, prescaler output otherwise.
3: The arrows indicate the points in time where sampling occurs.
External Clock/Prescaler
Output after sampling
External Clock Input or
Prescaler output
Therefore, the error in measuring the interval between two edges on Timer0 input = 4Tosc max.
Increment Timer0 (Q4)
OSC
TIMER0 TIMING WITH EXTERNAL CLOCK
). Also, there is a delay in the actual
(2)
Timer0
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
(3)
(1)
Preliminary
PIC16C64X & PIC16C66X
T0
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-
fore, it is necessary for T0CKI to have a period of at
least 4Tosc (and a small RC delay of 40 ns) divided by
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.
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 Timer0 mod-
ule is actually incremented. Figure 6-5 shows the delay
from the external clock edge to the timer incrementing.
TIMER0 INCREMENT DELAY
T0 + 1
T0 + 2
DS30559A-page 43
Small pulse
misses sampling