PIC16F648A-I/SS Microchip Technology, PIC16F648A-I/SS Datasheet - Page 94
![IC MCU FLASH 4KX14 EEPROM 20SSOP](/photos/6/58/65895/150-20-ssop_sml.jpg)
PIC16F648A-I/SS
Manufacturer Part Number
PIC16F648A-I/SS
Description
IC MCU FLASH 4KX14 EEPROM 20SSOP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F627A-IP.pdf
(180 pages)
3.PIC16F627A-IP.pdf
(8 pages)
4.PIC16F627A-IP.pdf
(22 pages)
5.PIC16F648A-ISS.pdf
(178 pages)
Specifications of PIC16F648A-I/SS
Core Size
8-Bit
Program Memory Size
7KB (4K x 14)
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
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-SSOP
Controller Family/series
PIC16F
No. Of I/o's
16
Eeprom Memory Size
256Byte
Ram Memory Size
256Byte
Cpu Speed
20MHz
No. Of Timers
3
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
16
Number Of Timers
1 x 16 bit
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 85 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
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT20SS-1 - SOCKET TRANSITION 18DIP 20SSOPI3DBF648 - BOARD DAUGHTER ICEPIC3AC164307 - MODULE SKT FOR PM3 28SSOPAC164018 - MODULE SKT PROMATEII 20SSOP
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F648A-I/SS
Manufacturer:
AD
Quantity:
240
Part Number:
PIC16F648A-I/SS
Manufacturer:
PIC18F14K50-I/SS
Quantity:
20 000
variables or other data that are updated often). When
PIC16F627A/628A/648A
13.7
The data EEPROM is a high endurance, byte
addressable array that has been optimized for the storage
of frequently changing information (e.g., program
variables in one section change frequently, while
variables in another section do not change, it is possible
to exceed the total number of write cycles to the EEPROM
(specification D124) without exceeding the total number
of write cycles to a single byte (specifications D120 and
D120A). If this is the case, then an array refresh must be
performed. For this reason, variables that change
infrequently (such as constants, IDs, calibration, etc.)
should be stored in Flash program memory.
EXAMPLE 13-4:
DS40044F-page 92
Loop
#IFDEF __16F648A
#ELSE
#ENDIF
BANKSEL
CLRF
BCF
BTFSC
GOTO
BSF
BSF
MOVLW
MOVWF
MOVLW
MOVWF
BSF
BTFSC
GOTO
INCFSZ
INCF
BTFSS
GOTO
BCF
BSF
Using the Data EEPROM
0X80
EEADR
INTCON, GIE
INTCON, GIE
$ - 2
EECON1, WREN
EECON1, RD
0x55
EECON2
0xAA
EECON2
EECON1, WR
EECON1, WR
$ - 1
EEADR, f
EEADR, f
EEADR, 7
Loop
EECON1, WREN
INTCON, GIE
DATA EEPROM REFRESH ROUTINE
;select Bank1
;start at address 0
;disable interrupts
;see AN576
;enable EE writes
;retrieve data into EEDATA
;first step of ...
;... required sequence
;second step of ...
;... required sequence
;start write sequence
;wait for write complete
;256 bytes in 16F648A
;test for end of memory
;128 bytes in 16F627A/628A
;next address
;test for end of memory
;end of conditional assembly
;repeat for all locations
;disable EE writes
;enable interrupts (optional)
A simple data EEPROM refresh routine is shown in
Example 13-4.
Note:
If data EEPROM is only used to store
constants and/or data that changes rarely,
an array refresh is likely not required. See
specification D124.
© 2007 Microchip Technology Inc.