PIC16F84AT-20E/SO Microchip Technology, PIC16F84AT-20E/SO Datasheet - Page 186
![IC MCU CMOS 20MHZ 1K FLSH 18SOIC](/photos/6/76/67656/150-18-soic_sml.jpg)
PIC16F84AT-20E/SO
Manufacturer Part Number
PIC16F84AT-20E/SO
Description
IC MCU CMOS 20MHZ 1K FLSH 18SOIC
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-20E/SO
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
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
18-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Connectivity
-
- Current page: 186 of 688
- Download datasheet (3Mb)
PICmicro MID-RANGE MCU FAMILY
DS31012A-page 12-6
Example 12-2
in
Example 12-2:
Writing a 16-bit value to the 16-bit TMR1 register is straight forward. First the TMR1L register is
cleared to ensure that there are many Timer1 clock/oscillator cycles before there is a rollover into
the TMR1H register. The TMR1H register is then loaded, and finally the TMR1L register is loaded.
Example 12-3
Example 12-3:
; All interrupts are disabled
;
; TMR1L may have rolled over between the read of the high and low bytes.
; Reading the high and low bytes now will read a good value.
;
; Re-enable the Interrupt (if required)
CONTINUE
; All interrupts are disabled
; Re-enable the Interrupt (if required)
CONTINUE
Example
MOVF
MOVWF
MOVF
MOVWF
MOVF
SUBWF
BTFSC
GOTO
MOVF
MOVWF
MOVF
MOVWF
CLRF
MOVLW
MOVWF
MOVLW
MOVWF
12-1. This is useful if the timer cannot be stopped.
shows a routine to read the 16-bit timer value with experiencing the issues shown
shows this:
TMR1H, W
TMPH
TMR1L, W
TMPL
TMR1H, W
TMPH,
STATUS,Z
CONTINUE
TMR1H, W
TMPH
TMR1L, W
TMPL
TMR1L
HI_BYTE
TMR1H, F
LO_BYTE
TMR1H, F
Reading a 16-bit Free-Running Timer
Writing a 16-bit Free Running Timer
W
; Read high byte
;
; Read low byte
;
; Read high byte
; Sub 1st read with 2nd read
; Is result = 0
; Good 16-bit read
; Read high byte
;
; Read low byte
;
; Continue with your code
; Clear Low byte, Ensures no
;
; Value to load into TMR1H
; Write High byte
; Value to load into TMR1L
; Write Low byte
; Continue with your code
rollover into TMR1H
1997 Microchip Technology Inc.
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