PIC16F88-I/P Microchip Technology Inc., PIC16F88-I/P Datasheet - Page 49
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PIC16F88-I/P
Manufacturer Part Number
PIC16F88-I/P
Description
18 PIN, 7 KB FLASH, 368 RAM, 16 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F88-IP.pdf
(228 pages)
Specifications of PIC16F88-I/P
A/d Inputs
7-Channel, 10-Bit
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
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4.7.3.2
A Reset will clear SCS<1:0> back to ‘00’. The
sequence for starting the primary oscillator following a
Reset is the same for all forms of Reset, including
POR. There is no transition sequence from the
alternate system clock to the primary system clock on
a Reset condition. Instead, the device will reset the
state of the OSCCON register and default to the
primary system clock. The sequence of events that
takes place after this will depend upon the value of the
FOSC bits in the Configuration register. If the external
oscillator is configured as a crystal (HS, XT or LP), the
CPU will be held in the Q1 state until 1024 clock cycles
have transpired on the primary clock. This is
necessary because the crystal oscillator has been
powered down until the time of the transition.
During
execution and/or peripheral operation is suspended.
If the primary system clock is either RC, EC or INTRC,
the CPU will begin operating on the first Q1 cycle
following the wake-up event. This means that there is
FIGURE 4-10:
2005 Microchip Technology Inc.
Note:
Note 1: T
System Clock
CPU Start-up
Peripheral
Program
Counter
2: T
3: T
T1OSI
OSC1
OSC2
OSTS
Clock
Reset
Sleep
the
OSC
CPU
T
If Two-Speed Clock Start-up mode is
enabled, the INTRC will act as the system
clock until the OST timer has timed out.
1
P
Returning to Primary Oscillator with
a Reset
= 30.52 s.
= 5-10 s (1 MHz system clock).
= 50 ns minimum.
oscillator
Q4
PC
PRIMARY SYSTEM CLOCK AFTER RESET (HS, XT, LP)
Q1
start-up
T
T
OST
CPU (3)
time,
0000h
instruction
Q1 Q2 Q3 Q4 Q1 Q2
T
OSC
T
T
1
P
(2)
(1)
no oscillator start-up time required because the
primary clock is already stable; however, there is a
delay between the wake-up event and the following
Q2. An internal delay timer of 5-10 s will suspend
operation after the Reset to allow the CPU to become
ready for code execution. The CPU and peripheral
clock will be held in the first Q1.
The sequence of events is as follows:
1.
2.
3.
4.
0001h
Q3 Q4 Q1 Q2
A device Reset is asserted from one of many
sources (WDT, BOR, MCLR, etc.).
The device resets and the CPU start-up timer is
enabled if in Sleep mode. The device is held in
Reset until the CPU start-up time-out is
complete.
If the primary system clock is configured as an
external oscillator (HS, XT, LP), then the OST
will be active waiting for 1024 clocks of the
primary system clock. While waiting for the OST,
the device will be held in Reset. The OST and
CPU start-up timers run in parallel.
After both the CPU start-up and OST timers
have timed out, the device will wait for one addi-
tional clock cycle and instruction execution will
begin.
0003h
Q3
PIC16F87/88
Q4
Q1 Q2 Q3 Q4
0004h
DS30487C-page 47
0005h
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