PIC16F88-I/SO Microchip Technology Inc., PIC16F88-I/SO Datasheet - Page 44

• Manufacturer Part Number: PIC16F88-I/SO
• Description: 18 PIN, 7 KB FLASH, 368 RAM, 16 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F88-I/SO

• 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 SOIC
• 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

PIC16F87/88
• Clock before switch: One of INTOSC/INTOSC
1.
2.
3.
4.
5.
TABLE 4-3:
DS30487C-page 42
Note 1:
INTRC/Sleep
postscaler (IRCF<2:0>
(31.25 kHz)
(31.25 kHz)
Sleep/POR
IRCF bits are modified to a different INTOSC/
INTOSC postscaler frequency.
edge of the current clock, at which point CLKO
is held low.
The clock switching circuitry then waits for eight
falling edges of requested clock, after which it
switches CLKO to this new clock source.
The IOFS bit is set.
Oscillator switchover is complete.
The clock switching circuitry waits for a falling
INTRC
INTRC
From
Sleep
Clock Switch
The 5-10 s start-up delay is based on a 1 MHz system clock.
LP, XT, HS 32.768 kHz-20 MHz
Postscaler
Postscaler
INTOSC/
INTOSC/
INTOSC
INTOSC
OSCILLATOR DELAY EXAMPLES
T1OSC
EC, RC
EC, RC
INTRC
To
000)
125 kHz-8 MHz
125 kHz-8 MHz
DC – 20 MHz
DC – 20 MHz
Frequency
32.768 kHz
31.25 kHz
4 ms (approx.) and
1024 Clock Cycles
Oscillator Delay
CPU Start-up
CPU Start-up
4 ms (approx.)
(OST)
4.6.6
Table 4-3 shows the different delays invoked for
various clock switching sequences. It also shows the
delays invoked for POR and wake-up.
(1)
(1)
Following a wake-up from Sleep mode or
POR, CPU start-up is invoked to allow the
CPU to become ready for code execution.
Following a change from INTRC, an OST
of 1024 cycles must occur.
Refer to Section 4.6.4 “Modifying the
IRCF Bits” for further details.
OSCILLATOR DELAY UPON
POWER-UP, WAKE-UP AND
CLOCK SWITCHING
 2005 Microchip Technology Inc.
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