PIC16F88-I/SO Microchip Technology Inc., PIC16F88-I/SO Datasheet - Page 134

• 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
15.2
The PIC16F87/88 differentiates between various kinds
of Reset:
• Power-on Reset (POR)
• MCLR Reset during normal operation
• MCLR Reset during Sleep
• WDT Reset during normal operation
• WDT wake-up during Sleep
• Brown-out Reset (BOR)
FIGURE 15-1:
DS30487C-page 132
OSC1
MCLR
V
DD
Reset
31.25 kHz
INTRC
OST/PWRT
Brown-out
V
Module
Detect
DD
WDT
Reset
Rise
OST
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
PWRT
10-bit Ripple Counter
Time-out
Reset
WDT
11-bit Ripple Counter
BOREN
Power-on Reset
External
Reset
Sleep
Some registers are not affected in any Reset condition.
Their status is unknown on POR and unchanged in any
other Reset. Most other registers are reset to a “Reset
state” on Power-on Reset (POR), on the MCLR and
WDT Reset, on MCLR Reset during Sleep and Brown-
out Reset (BOR). They are not affected by a WDT
wake-up which is viewed as the resumption of normal
operation. The TO and PD bits are set or cleared
differently in different Reset situations, as indicated in
Table 15-3. These bits are used in software to deter-
mine the nature of the Reset. Upon a POR, BOR or
wake-up from Sleep, the CPU requires approximately
5-10 s to become ready for code execution. This
delay runs in parallel with any other timers. See
Table 15-4 for a full description of Reset states of all
registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 15-1.
 2005 Microchip Technology Inc.
S
R
Q
Chip_Reset
Enable PWRT
Enable OST