PIC16F627-04/SO Microchip Technology, PIC16F627-04/SO Datasheet - Page 57

• Manufacturer Part Number: PIC16F627-04/SO
• Description: IC MCU FLASH 1KX14 COMP 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F627-04/SO

• Core Size: 8-Bit
• Program Memory Size: 1.75KB (1K x 14)
• Core Processor: PIC
• Speed: 4MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 224 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 18-SOIC (7.5mm Width)
• Controller Family/series: PIC16F
• No. Of I/o's: 16
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 224Byte
• Cpu Speed: 4MHz
• No. Of Timers: 3
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 224 B
• Interface Type: SCI, USART
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 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: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILAC164010 - MODULE SKT PROMATEII DIP/SOIC
• Data Converters: -
• Lead Free Status / Rohs Status: Details

 2003 Microchip Technology Inc.
The code example in Example 9-1 depicts the steps
required to configure the Comparator module. RA3 and
RA4 are configured as digital output. RA0 and RA1 are
configured as the V- inputs and RA2 as the V+ input to
both comparators.
EXAMPLE 9-1:
9.2
A single comparator is shown in Figure 9-2 along with
the relationship between the analog input levels and
the digital output. When the analog input at V
than the analog input V
is a digital low level. When the analog input at V
greater than the analog input V
comparator is a digital high level. The shaded areas of
the output of the comparator in Figure 9-2 represent
the uncertainty due to input offsets and response time.
9.3
An external or internal reference signal may be used
depending on the Comparator Operating mode. The
analog signal that is present at V
signal at V
is adjusted accordingly (Figure 9-2).
FLAG_REG EQU
CLRF
CLRF
MOVF
ANDLW
IORWF
MOVLW
MOVWF
BSF
MOVLW
MOVWF
BCF
CALL
MOVF
BCF
BSF
BSF
BCF
BSF
BSF
Comparator Operation
Comparator Reference
FLAG_REG
PORTA
CMCON, W
0xC0
FLAG_REG,F
0x03
CMCON
STATUS,RP0
0x07
TRISA
STATUS,RP0
DELAY10
CMCON,F
PIR1,CMIF
STATUS,RP0
PIE1,CMIE
STATUS,RP0
INTCON,PEIE ;Enable peripheral interrupts
INTCON,GIE
IN
+, and the digital output of the comparator
0X20
;Init flag register
;Init PORTA
;Load comparator bits
;Mask comparator bits
;Store bits in flag register
;Init comparator mode
;CM<2:0> = 011
;Select Bank1
;Initialize data direction
;Set RA<2:0> as inputs
;RA<4:3> as outputs
;TRISA<7:5> always read ‘0’
;Select Bank 0
;10µs delay
;Read CMCON to end change condition
;Clear pending interrupts
;Select Bank 1
;Enable comparator interrupts
;Select Bank 0
;Global interrupt enable
INITIALIZING
COMPARATOR MODULE
IN
-, the output of the comparator
IN
IN
- is compared to the
-, the output of the
IN
+ is less
IN
+ is
Preliminary
FIGURE 9-2:
9.3.1
When external voltage references are used, the
comparator module can be configured to have the
comparators operate from the same or different
reference sources. However, threshold detector
applications may require the same reference. The
reference signal must be between V
can be applied to either pin of the comparator(s).
9.3.2
The Comparator module also allows the selection of an
internally
comparators. Section 10.0, Voltage Reference Manual,
contains a detailed description of the Voltage Refer-
ence module that provides this signal. The internal
reference signal is used when the comparators are in
mode CM<2:0>=010 (Figure 9-1). In this mode, the
internal voltage reference is applied to the V
both comparators.
9.4
Response time is the minimum time, after selecting a
new reference voltage or input source, before the
comparator output is ensured to have a valid level. If
the internal reference is changed, the maximum delay
of the internal voltage reference must be considered
when using the comparator outputs. Otherwise the
maximum delay of the comparators should be used
(Table 17-1).
V
V
Result
IN
IN
-
+
Vi
V
IN
N
Comparator Response Time
+
-
generated
EXTERNAL REFERENCE SIGNAL
INTERNAL REFERENCE SIGNAL
+
–
SINGLE COMPARATOR
voltage
PIC16F62X
reference
DS40300C-page 55
SS
Result
and V
IN
for
DD
+ pin of
, and
the