PIC12HV609-I/SN Microchip Technology, PIC12HV609-I/SN Datasheet - Page 54
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PIC12HV609-I/SN
Manufacturer Part Number
PIC12HV609-I/SN
Description
IC PIC MCU FLASH 1KX14 8SOIC
Manufacturer
Microchip Technology
Series
PIC® 12Fr
Datasheets
1.PIC12F609T-ISN.pdf
(212 pages)
2.PIC12F609T-ISN.pdf
(8 pages)
3.PIC12F609T-ISN.pdf
(26 pages)
4.PIC16F616T-ISL.pdf
(8 pages)
5.PIC12F615-ESN.pdf
(168 pages)
Specifications of PIC12HV609-I/SN
Program Memory Type
FLASH
Program Memory Size
1.75KB (1K x 14)
Package / Case
8-SOIC (3.9mm Width)
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
5
Ram Size
64 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC12H
Core
PIC
Data Bus Width
8 bit
Data Ram Size
64 B
Interface Type
RS-232 / USB
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
5
Number Of Timers
2
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
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AC162083 - HEADER MPLAB ICD2 PIC16F616 8/14
Eeprom Size
-
Data Converters
-
Connectivity
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC12HV609-I/SN
Manufacturer:
MICROCHIP
Quantity:
840
PIC12F609/615/617/12HV609/615
6.1.3
A single software programmable prescaler is available
for use with either Timer0 or the Watchdog Timer
(WDT), but not both simultaneously. The prescaler
assignment is controlled by the PSA bit of the OPTION
register. To assign the prescaler to Timer0, the PSA bit
must be cleared to a ‘0’.
There are 8 prescaler options for the Timer0 module
ranging from 1:2 to 1:256. The prescale values are
selectable via the PS<2:0> bits of the OPTION register.
In order to have a 1:1 prescaler value for the Timer0
module, the prescaler must be assigned to the WDT
module.
The prescaler is not readable or writable. When
assigned to the Timer0 module, all instructions writing to
the TMR0 register will clear the prescaler.
When the prescaler is assigned to WDT, a CLRWDT
instruction will clear the prescaler along with the WDT.
6.1.3.1
As a result of having the prescaler assigned to either
Timer0 or the WDT, it is possible to generate an
unintended device Reset when switching prescaler
values. When changing the prescaler assignment from
Timer0 to the WDT module, the instruction sequence
shown in Example 6-1, must be executed.
EXAMPLE 6-1:
DS41302D-page 54
BANKSEL
CLRWDT
CLRF
BANKSEL
BSF
CLRWDT
MOVLW
ANDWF
IORLW
MOVWF
SOFTWARE PROGRAMMABLE
PRESCALER
TMR0
TMR0
OPTION_REG
OPTION_REG,PSA
b’11111000’
OPTION_REG,W
b’00000101’
OPTION_REG
Switching Prescaler Between
Timer0 and WDT Modules
CHANGING PRESCALER
(TIMER0 WDT)
;
;Clear WDT
;Clear TMR0 and
;prescaler
;
;Select WDT
;
;
;Mask prescaler
;bits
;Set WDT prescaler
;to 1:32
When changing the prescaler assignment from the
WDT to the Timer0 module, the following instruction
sequence must be executed (see Example 6-2).
EXAMPLE 6-2:
6.1.4
Timer0 will generate an interrupt when the TMR0
register overflows from FFh to 00h. The T0IF interrupt
flag bit of the INTCON register is set every time the
TMR0 register overflows, regardless of whether or not
the Timer0 interrupt is enabled. The T0IF bit must be
cleared in software. The Timer0 interrupt enable is the
T0IE bit of the INTCON register.
6.1.5
When Timer0 is in Counter mode, the synchronization
of the T0CKI input and the Timer0 register is
accomplished by sampling the prescaler output on the
Q2 and Q4 cycles of the internal phase clocks.
Therefore, the high and low periods of the external
clock source must meet the timing requirements as
shown in Section 16.0 “Electrical Specifications”.
CLRWDT
BANKSEL OPTION_REG
MOVLW
ANDWF
IORLW
MOVWF
Note:
b’11110000’
OPTION_REG,W ;prescaler bits
b’00000011’
OPTION_REG
TIMER0 INTERRUPT
The Timer0 interrupt cannot wake the
processor from Sleep since the timer is
frozen during Sleep.
USING TIMER0 WITH AN
EXTERNAL CLOCK
CHANGING PRESCALER
(WDT TIMER0)
2010 Microchip Technology Inc.
;Clear WDT and
;prescaler
;
;Mask TMR0 select and
;Set prescale to 1:16
;