PIC12F519-I/MS Microchip Technology, PIC12F519-I/MS Datasheet - Page 36

• Manufacturer Part Number: PIC12F519-I/MS
• Description: IC PIC MCU FLASH 1KX12 8MSOP
• Manufacturer: Microchip Technology
• Series: PIC® 12Fr

Specifications of PIC12F519-I/MS

• Core Size: 8-Bit
• Program Memory Size: 1.5KB (1K x 12)
• Core Processor: PIC
• Speed: 8MHz
• Peripherals: POR, WDT
• Number Of I /o: 5
• Program Memory Type: FLASH
• Ram Size: 41 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Controller Family/series: PIC12
• No. Of I/o's: 6
• Eeprom Memory Size: 64Byte
• Ram Memory Size: 41Byte
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Processor Series: PIC12F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 41 B
• Interface Type: USB
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 1
• 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
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162096 - HEADER MPLAB ICD2 PIC16F526 8/14AC164325 - MODULE SKT FOR 8MSOP
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

PIC12F519
7.2
An 8-bit counter is available as a prescaler for the
Timer0 module or as a postscaler for the Watchdog
Timer (WDT), respectively (see Section 8.6 “Watch-
dog Timer (WDT)”). For simplicity, this counter is
being referred to as “prescaler” throughout this data
sheet.
The PSA and PS<2:0> bits (OPTION<3:0>) determine
prescaler assignment and prescale ratio.
When assigned to the Timer0 module, all instructions
writing to the TMR0 register (e.g., CLRF TMR0,
MOVWF TMR0,
assigned to WDT, a CLRWDT instruction will clear the
prescaler along with the WDT. The prescaler is neither
readable nor writable. On a Reset, the prescaler con-
tains all ‘0’s.
7.2.1
The prescaler assignment is fully under software
control (i.e., it can be changed “on-the-fly” during pro-
gram execution). To avoid an unintended device Reset,
the following instruction sequence (Example 7-1) must
be executed when changing the prescaler assignment
from Timer0 to the WDT.
DS41319B-page 34
Note:
Prescaler
The prescaler may be used by either the
Timer0 module or the WDT, but not both.
Thus, a prescaler assignment for the
Timer0 module means that there is no
prescaler for the WDT and vice versa.
SWITCHING PRESCALER
ASSIGNMENT
etc.) will clear the prescaler. When
EXAMPLE 7-1:
To change the prescaler from the WDT to the Timer0
module, use the sequence shown in Example 7-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT instruction should be executed before
switching the prescaler.
EXAMPLE 7-2:
CLRWDT
CLRF
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
TMR0
b‘00xx1111’
b‘00xx1xxx’ ;Set Postscaler to
b‘xxxx0xxx’ ;Select TMR0, new
CHANGING PRESCALER
(TIMER0 → WDT)
CHANGING PRESCALER
(WDT → TIMER0)
;Clear WDT
;Clear TMR0 and Prescaler
;PS<2:0> are 000 or 001
;desired WDT rate
© 2008 Microchip Technology Inc.
;Clear WDT and
;prescaler
;prescale value and
;clock source