PIC16F688-I/P Microchip Technology, PIC16F688-I/P Datasheet - Page 47

• Manufacturer Part Number: PIC16F688-I/P
• Description: IC PIC MCU FLASH 4KX14 14DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F688-I/P

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 14-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SCI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Data Rom Size: 256 B
• Height: 3.3 mm
• Length: 19.05 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 6.35 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162066 - HEADER INTRFC MPLAB ICD2 20PINAC162061 - HEADER INTRFC MPLAB ICD2 20PINDM163029 - BOARD PICDEM FOR MECHATRONICSAC162056 - HEADER INTERFACE ICD2 16F688ACICE0207 - MPLABICE 14P 300 MIL ADAPTERAC124001 - MODULE SKT PROMATEII 8DIP/SOIC
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.0
The Timer0 module timer/counter has the following
features:
• 8-bit timer/counter
• Readable and writable
• 8-bit software programmable prescaler
• Internal or external clock select
• Interrupt on overflow from FFh to 00h
• Edge select for external clock
Figure 5-1 is a block diagram of the Timer0 module and
the prescaler shared with the WDT.
5.1
Timer mode is selected by clearing the T0CS bit
(OPTION_REG<5>). In Timer mode, the Timer0
module will increment every instruction cycle (without
prescaler). If TMR0 is written, the increment is inhibited
for the following two instruction cycles. The user can
work around this by writing an adjusted value to the
TMR0 register.
FIGURE 5-1:
 2004 Microchip Technology Inc.
T0CKI
SWDTEN
Note:
pin
Note 1: T0SE, T0CS, PSA, PS<2:0> are bits in the Option register, WDTPS<3:0> are bits in the WDTCON register.
WDTE
(= F
CLKOUT
OSC
T0SE
TIMER0 MODULE
Timer0 Operation
31 kHz
INTRC
/4)
Additional information on the Timer0
module is available in the “PICmicro
Range MCU Family Reference Manual”
(DS33023).
Watchdog
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
Timer
T0CS
0
1
PSA
Prescaler
0
1
16-bit
16
®
Prescaler
WDTPS<3:0>
Mid-
8-bit
Preliminary
8
PS<2:0>
Counter mode is selected by setting the T0CS bit
(OPTION_REG<5>). In this mode, the Timer0 module
will increment either on every rising or falling edge of
pin RA2/T0CKI. The incrementing edge is determined
by
(OPTION_REG<4>). Clearing the T0SE bit selects the
rising edge.
5.2
A Timer0 interrupt is generated when the TMR0 regis-
ter timer/counter overflows from FFh to 00h. This over-
flow sets the T0IF bit (INTCON<2>). The interrupt can
be masked by clearing the T0IE bit (INTCON<5>). The
T0IF bit must be cleared in software by the Timer0
module Interrupt Service Routine before re-enabling
this interrupt. The Timer0 interrupt cannot wake the
processor from Sleep, since the timer is shut off during
Sleep.
Note:
the
Timer0 Interrupt
Counter mode has specific external clock
requirements. Additional information on
these requirements is available in the
”PICmicro
Reference Manual” (DS33023).
PSA
PSA
source
1
0
1
0
SYNC 2
Cycles
Time-out
®
edge
WDT
Mid-Range
PIC16F688
(T0SE)
Data Bus
Set Flag bit T0IF
DS41203B-page 45
8
TMR0
on Overflow
MCU
control
Family
bit