PIC16F688-I/SL Microchip Technology Inc., PIC16F688-I/SL Datasheet - Page 114

• Manufacturer Part Number: PIC16F688-I/SL
• Description: 14 PIN, 7 KB FLASH, 256 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F688-I/SL

• A/d Inputs: 8-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 12
• Interface: USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 14-pin SOIC-N
• Programmable Memory: 7K Bytes
• Ram Size: 256 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F688
11.2
The PIC16F688 differentiates between various kinds of
Reset:
a)
b)
c)
d)
e)
f)
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
• MCLR Reset
• MCLR Reset during Sleep
• WDT Reset
• Brown-out Reset (BOR)
FIGURE 11-1:
DS41203C-page 112
MCLR/V
Power-on Reset (POR)
WDT Reset during normal operation
WDT Reset during Sleep
Brown-out Reset (BOR)
MCLR Reset during normal operation
MCLR Reset during Sleep
CLKI pin
OSC1/
Note 1:
V
DD
Reset
PP
pin
LFINTOSC
OST/PWRT
Refer to the Configuration Word register (Register 11-1).
Brown-out
V
Module
Detect
DD
WDT
Reset
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
Rise
OST
PWRT
(1)
10-bit Ripple Counter
WDT
Time-out
Reset
11-bit Ripple Counter
SBOREN
BOREN
Power-on Reset
External
Reset
Sleep
They are not affected by a WDT wake-up since this is
viewed as the resumption of normal operation. TO and
PD bits are set or cleared differently in different Reset
situations, as indicated in Table 11-2. These bits are
used in software to determine the nature of the Reset.
See Table 11-4 for a full description of Reset states of
all registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 11-1.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Section 14.0 “Electrical
Specifications” for pulse width specifications.
Enable PWRT
Enable OST
© 2006 Microchip Technology Inc.
S
R
Q
Chip_Reset