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PIC16C54A-20/SO
PIC16C54A-20/SO | |
|---|---|
| Manufacturer Part Number | PIC16C54A-20/SO |
| Description | IC MCU OTP 512X12 18SOIC |
| Manufacturer | Microchip Technology |
| Series | PIC® 16C |
| PIC16C54A-20/SO datasheets |
|
Availability: By request
International delivery:
Warranty: 60 days
×
- We provide standard 60-days warranty for all parts. If warranty differs we always mention it beforehand. In case of return we cover shipping costs.
- If you still have any questions - please contact us
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Specifications of PIC16C54A-20/SO | |||
|---|---|---|---|
| Core Processor | PIC | Core Size | 8-Bit |
| Speed | 20MHz | Peripherals | POR, WDT |
| Number Of I /o | 12 | Program Memory Size | 768B (512 x 12) |
| Program Memory Type | OTP | Ram Size | 25 x 8 |
| Voltage - Supply (vcc/vdd) | 4.5 V ~ 5.5 V | Oscillator Type | External |
| Operating Temperature | 0°C ~ 70°C | Package / Case | 18-SOIC (7.5mm Width) |
| For Use With | XLT18SO-1 - SOCKET TRANSITION 18SOIC 300MIL309-1075 - ADAPTER 18-SOIC TO 18-SOIC309-1011 - ADAPTER 18-SOIC TO 18-DIP309-1010 - ADAPTER 18-SOIC TO 18-DIPAC164002 - MODULE SKT PROMATEII 18/28SOIC | Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
| Eeprom Size | - | Data Converters | - |
| Connectivity | - | ||
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PIC16C5X
8.2
Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module, or as a postscaler for the Watchdog
Timer (WDT), respectively (Section 9.2.1). For simplic-
ity, this counter is being referred to as “prescaler”
throughout this data sheet. Note that 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.
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.,
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 nei-
ther readable nor writable. On a RESET, the prescaler
contains all '0's.
8.2.1
SWITCHING PRESCALER
ASSIGNMENT
The prescaler assignment is fully under software con-
trol (i.e., it can be changed “on the fly” during program
execution). To avoid an unintended device RESET, the
following instruction sequence (Example 8-1) must be
executed when changing the prescaler assignment
from Timer0 to the WDT.
DS30453D-page 40
EXAMPLE 8-1:
CLRWDT
CLRF
TMR0
MOVLW
B'00xx1111’ ;Last 3 instructions in
OPTION
CLRWDT
MOVLW
B'00xx1xxx’ ;Set Prescaler to
OPTION
To change prescaler from the WDT to the Timer0 mod-
ule, use the sequence shown in Example 8-2. This
sequence must be used even if the WDT is disabled. A
CLRF 1,
CLRWDT instruction should be executed before switch-
ing the prescaler.
EXAMPLE 8-2:
CLRWDT
MOVLW
B'xxxx0xxx'
OPTION
Preliminary
CHANGING PRESCALER
(TIMER0 WDT)
;Clear WDT
;Clear TMR0 & Prescaler
this example
;are required only if
;desired
;PS<2:0> are 000 or
;001
;desired WDT rate
CHANGING PRESCALER
(WDT TIMER0)
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source
2002 Microchip Technology Inc.
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PIC16C54A-10/SS |
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