PIC16F84AT-04E/SS Microchip Technology, PIC16F84AT-04E/SS Datasheet - Page 176
![IC MCU CMOS 4MHZ 1K FLASH 20SSOP](/photos/6/58/65895/150-20-ssop_sml.jpg)
PIC16F84AT-04E/SS
Manufacturer Part Number
PIC16F84AT-04E/SS
Description
IC MCU CMOS 4MHZ 1K FLASH 20SSOP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F688T-ISL.pdf
(688 pages)
2.PIC16F84A-04P.pdf
(88 pages)
3.PIC16F84A-04P.pdf
(6 pages)
Specifications of PIC16F84AT-04E/SS
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
13
Program Memory Size
1.75KB (1K x 14)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
68 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
20-SSOP
For Use With
XLT20SS1-1 - SOCKET TRANSITION 20DIP 20SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Connectivity
-
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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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