PIC16F648A-I/ML Microchip Technology, PIC16F648A-I/ML Datasheet - Page 49

IC MCU FLASH 4KX14 EEPROM 28QFN

PIC16F648A-I/ML

Manufacturer Part Number
PIC16F648A-I/ML
Description
IC MCU FLASH 4KX14 EEPROM 28QFN
Manufacturer
Microchip Technology
Series
PIC® 16Fr

Specifications of PIC16F648A-I/ML

Core Size
8-Bit
Program Memory Size
7KB (4K x 14)
Oscillator Type
Internal
Core Processor
PIC
Speed
20MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Controller Family/series
PIC16F
No. Of I/o's
16
Eeprom Memory Size
256Byte
Ram Memory Size
256Byte
Cpu Speed
20MHz
No.
RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AC164324 - MODULE SKT FOR MPLAB 8DFN/16QFNXLT28QFN3 - SOCKET TRAN ICE 18DIP/28QFNI3DBF648 - BOARD DAUGHTER ICEPIC3AC164033 - ADAPTER 28QFN TO 18DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
Data Converters
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
6.3.1
The prescaler assignment is fully under software
control (i.e., it can be changed “on-the-fly” during
program execution). Use the instruction sequences
shown in Example 6-1 when changing the prescaler
assignment from Timer0 to WDT, to avoid an
unintended device Reset.
EXAMPLE 6-1:
TABLE 6-1:
© 2005 Microchip Technology Inc.
01h, 101h
0Bh, 8Bh,
10Bh, 18Bh
81h, 181h
85h
Legend:
Note 1:
BCF
CLRWDT
CLRF
BSF
MOVLW
MOVWF
CLRWDT
MOVLW
MOVWF
BCF
Address
STATUS, RP0
TMR0
STATUS, RP0
'00101111’b
OPTION_REG
'00101xxx’b
OPTION_REG
STATUS, RP0
- = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown. Shaded cells are not used for Timer0.
Option is referred by OPTION_REG in MPLAB
SWITCHING PRESCALER
ASSIGNMENT
TMR0
INTCON
OPTION
TRISA
Name
REGISTERS ASSOCIATED WITH TIMER0
(2)
CHANGING PRESCALER
(TIMER0
Timer0 Module Register
TRISA7 TRISA6 TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 1111 1111 1111 1111
RBPU
Bit 7
GIE
;Skip if already in
;Bank 0
;Clear WDT
;Clear TMR0 and
;Prescaler
;Bank 1
;These 3 lines
;(5, 6, 7)
;are required only
;if desired PS<2:0>
;are
;000 or 001
;Set Postscaler to
;desired WDT rate
;Return to Bank 0
INTEDG
PEIE
Bit 6
WDT)
T0CS
Bit 5
T0IE
T0SE
Bit 4
INTE
®
IDE Software.
PIC16F627A/628A/648A
RBIE
Bit 3
PSA
To change prescaler from the WDT to the Timer0
module, use the sequence shown in Example 6-2. This
precaution must be taken even if the WDT is disabled.
EXAMPLE 6-2:
CLRWDT
BSF
MOVLW
MOVWF
BCF
Bit 2
T0IF
PS2
STATUS, RP0
b'xxxx0xxx’
OPTION_REG
STATUS, RP0
Bit 1
INTF
PS1
CHANGING PRESCALER
(WDT
RBIF
Bit 0
PS0
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source
xxxx xxxx uuuu uuuu
0000 000x 0000 000u
1111 1111 1111 1111
Value on
TIMER0)
POR
DS40044D-page 47
All Other
Value on
Resets

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