PIC16F877-04E/PQ Microchip Technology, PIC16F877-04E/PQ Datasheet - Page 176
![IC MCU FLASH 8KX14 EE 44-MQFP](/photos/6/59/65984/150-44-pqfp_sml.jpg)
PIC16F877-04E/PQ
Manufacturer Part Number
PIC16F877-04E/PQ
Description
IC MCU FLASH 8KX14 EE 44-MQFP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16C770-ISO.pdf
(8 pages)
4.PIC16F873-04SO.pdf
(218 pages)
5.PIC16F873-04SO.pdf
(5 pages)
6.PIC16F873-04SO.pdf
(5 pages)
Specifications of PIC16F877-04E/PQ
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
14KB (8K x 14)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
368 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
44-MQFP, 44-PQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
PIC16F87704E/PQ
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F877-04E/PQ
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PIC16F688T-ISL PDF datasheet #2
- PIC16C770-ISO PDF datasheet #3
- PIC16F873-04SO PDF datasheet #4
- PIC16F873-04SO PDF datasheet #5
- PIC16F873-04SO PDF datasheet #6
- Current page: 176 of 688
- Download datasheet (3Mb)
PICmicro MID-RANGE MCU FAMILY
11.6.1
DS31011A-page 11-8
Lines 2 and 3 do
NOT have to be
included if the final
desired prescale
value is other than
1:1. If 1:1 is final
desired value, then a
temporary prescale
value is set in lines 2
and 3 and the final
prescale value will
be set in lines 10
and 11.
Switching Prescaler Assignment
The prescaler assignment is fully under software control, i.e., it can be changed “on the fly” during
program execution.
In
final desired prescaler is other then 1:1. If the final prescaler value is to be 1:1, then a temporary
prescale value is set (other than 1:!), and the final prescale value is set in the last modification of
OPTION_REG.
Example 11-1: Changing Prescaler (Timer0 WDT)
To change prescaler from the WDT to the Timer0 module use the sequence shown in
Example
Example 11-2: Changing Prescaler (WDT Timer0)
1)
2)
3)
4)
5)
6)
7)
8)
9)
10) MOVLW
11) MOVWF
12) BCF
Example
BSF
MOVLW
MOVWF
BCF
CLRF
BSF
MOVLW
MOVWF
CLRWDT
CLRWDT
BSF
MOVLW
MOVWF
BCF
11-2.
Note:
11-1, the first modification of the OPTION_REG does not need to be included if the
STATUS, RP0
b'xx0x0xxx'
OPTION_REG
STATUS, RP0
TMR0
STATUS, RP1
b'xxxx1xxx'
OPTION_REG
b'xxxx1xxx'
OPTION_REG
STATUS, RP0
STATUS, RP0
b'xxxx0xxx'
OPTION_REG
STATUS, RP0
To avoid an unintended device RESET, the following instruction sequence
(shown in
assignment from Timer0 to the WDT. This sequence must be followed even if
the WDT is disabled.
Example
;Bank1
;Select clock source and prescale value of
;other than 1:1
;Bank0
;Clear TMR0 and prescaler
;Bank1
;Select WDT, do not change prescale value
;
;Clears WDT and prescaler
;Select new prescale value and WDT
;
;Bank0
; Clear WDT and prescaler
; Bank1
; Select TMR0, new prescale
; value and clock source
; Bank0
11-1) must be executed when changing the prescaler
1997 Microchip Technology Inc.
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