PIC16F87-I/P Microchip Technology Inc., PIC16F87-I/P Datasheet - Page 46
PIC16F87-I/P
Manufacturer Part Number
PIC16F87-I/P
Description
MCU, 8-Bit, 4KW Flash, 368 RAM, 16 I/O, DIP-18
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F87-IP.pdf
(228 pages)
Specifications of PIC16F87-I/P
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Input Output
16
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
18-pin PDIP
Programmable Memory
7K Bytes
Ram Size
368 Bytes
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F87-I/P
Manufacturer:
MICROCHIP
Quantity:
3 000
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PIC16F87/88
4.7.2
The core and peripherals can be configured to be
clocked by T1OSC using a 32.768 kHz crystal. The
crystal must be connected to the T1OSO and T1OSI
pins. This is the same configuration as the low-power
timer circuit (see Section 7.6 “Timer1 Oscillator”).
When SCS bits are configured to run from T1OSC, a
clock transition is generated. It will clear the OSTS bit,
switch the system clock from either the primary system
clock or INTRC, depending on the value of SCS<1:0>
and FOSC<2:0>, to the external low-power Timer1
oscillator input (T1OSC) and shut down the primary
system clock to conserve power.
After a clock switch has been executed, the internal Q
clocks are held in the Q1 state until eight falling edge
clocks are counted on the T1OSC. After the eight
clock periods have transpired, the clock input to the Q
clocks is released and operation resumes (see
Figure 4-8). In addition, T1RUN (In T1CON) is set to
indicate that T1OSC is being used as the system
clock.
FIGURE 4-8:
DS30487C-page 44
Note 1: T
SCS<1:0>
Program
Counter
System
T1OSI
OSC1
Clock
2: T
3: T
4: T
Q1
SEC_RUN MODE
OSC
SCS
T
DLY
1
T
OSC
P
Q2
= 8 T
= 1 T
= 30.52 s.
= 50 ns minimum.
PC
(2)
Q3
T
T
Q4
1
1
P
P
TIMING DIAGRAM FOR SWITCHING TO SEC_RUN MODE
.
T
Q1
DLY (4)
T
T
1
P
(1)
T
SCS
(3)
PC +1
Note 1: The T1OSCEN bit must be enabled and it
Q1
2: When T1OSCEN = 0, the following possible
Q2
A clock switching event will occur if the
final state of the SCS bits is different from
the original.
is the user’s responsibility to ensure
T1OSC is stable before clock switching to
the T1OSC input clock can occur.
effects result.
SCS<1:0>
Original
Q3
00
00
10
10
Q4
2005 Microchip Technology Inc.
SCS<1:0>
Modified
Q1
01
11
11
01
Q2
PC + 2
00 – no change
10 – INTRC
10 – no change
00 – Oscillator
defined by
FOSC<2:0>
Q3
SCS<1:0>
Final
Q4
PC + 3
Q1
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