PIC12F508-I/P Microchip Technology, PIC12F508-I/P Datasheet - Page 38
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PIC12F508-I/P
Manufacturer Part Number
PIC12F508-I/P
Description
IC MCU FLASH 512X12 8DIP
Manufacturer
Microchip Technology
Series
PIC® 12Fr
Datasheets
1.PIC12F509T-ISN.pdf
(110 pages)
2.PIC12F509T-ISN.pdf
(4 pages)
3.PIC12F509T-ISN.pdf
(20 pages)
4.PIC12F509-EMC.pdf
(106 pages)
Specifications of PIC12F508-I/P
Program Memory Type
FLASH
Program Memory Size
768B (512 x 12)
Package / Case
8-DIP (0.300", 7.62mm)
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
5
Ram Size
25 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC12F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
25 B
Interface Type
RS- 232/USB
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
6
Number Of Timers
1
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164101, DM163014, DV164120, DM163029
Minimum Operating Temperature
- 40 C
Package
8PDIP
Device Core
PIC
Family Name
PIC12
Maximum Speed
4 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AC162059 - HEADER INTRFC MPLAB ICD2 8/14PINDM163029 - BOARD PICDEM FOR MECHATRONICSDVA12XP080 - ADAPTER DEVICE FOR MPLAB-ICEAC124001 - MODULE SKT PROMATEII 8DIP/SOIC
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:
PIC12F508-I/P
Manufacturer:
Grayhill
Quantity:
101
Part Number:
PIC12F508-I/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
PIC12F508/509/16F505
6.2
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 7.6 “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 1, MOVWF 1,
BSF 1, x, etc.) will clear the prescaler. When 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 contains all ‘0’s.
6.2.1
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 6-1) must
be executed when changing the prescaler assignment
from Timer0 to the WDT.
DS41236D-page 36
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
Preliminary
EXAMPLE 6-1:
To change the prescaler from the WDT to the Timer0
module, use the sequence shown in Example 6-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT instruction should be executed before
switching the prescaler.
EXAMPLE 6-2:
CLRWDT
CLRF
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
TMR0
‘00xx1111’b ;These 3 lines (5, 6, 7)
‘00xx1xxx’b ;Set Postscaler to
‘xxxx0xxx’
CHANGING PRESCALER
(TIMER0 → WDT)
CHANGING PRESCALER
(WDT → TIMER0)
;Clear WDT
;Clear TMR0 & Prescaler
;are required only if
;desired
;PS<2:0> are 000 or 001
;desired WDT rate
© 2007 Microchip Technology Inc.
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source