PIC16C57C-04/SO Microchip Technology, PIC16C57C-04/SO Datasheet - Page 42
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PIC16C57C-04/SO
Manufacturer Part Number
PIC16C57C-04/SO
Description
IC MCU OTP 2KX12 28SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16C57C-04/SO
Core Size
8-Bit
Program Memory Size
3KB (2K x 12)
Core Processor
PIC
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
20
Program Memory Type
OTP
Ram Size
72 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
28-SOIC (7.5mm Width)
Controller Family/series
PIC16C
No. Of I/o's
20
Ram Memory Size
72Byte
Cpu Speed
4MHz
No. Of Timers
1
Digital Ic Case Style
SOIC
Processor Series
PIC16C
Core
PIC
Data Bus Width
8 bit
Data Ram Size
72 B
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
20
Number Of Timers
8
Operating Supply Voltage
2.5 V to 5.5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
ICE2000
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT28SO-1 - SOCKET TRANSITION 28SOIC 300MIL309-1073 - ADAPTER 28-SOIC TO 28-SOIC309-1023 - ADAPTER 28-SOIC TO 28-DIP309-1011 - ADAPTER 18-SOIC TO 18-DIP309-1010 - ADAPTER 18-SOIC TO 18-DIPAC164002 - MODULE SKT PROMATEII 18/28SOIC
Eeprom Size
-
Data Converters
-
Connectivity
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16C57C-04/SO
Manufacturer:
MICROCHI
Quantity:
22
Part Number:
PIC16C57C-04/SO
Manufacturer:
MIC
Quantity:
20 000
PIC16C5X
8.2
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
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
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
to
Prescaler
SWITCHING PRESCALER
ASSIGNMENT
the
TMR0
register
(e.g.,
CLRF 1,
Preliminary
EXAMPLE 8-1:
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
CLRWDT instruction should be executed before switch-
ing the prescaler.
EXAMPLE 8-2:
CLRWDT
MOVLW
OPTION
CLRWDT
CLRF
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
B'xxxx0xxx'
TMR0
B'00xx1111’ ;Last 3 instructions in
B'00xx1xxx’ ;Set Prescaler to
(TIMER0 WDT)
(WDT TIMER0)
CHANGING PRESCALER
CHANGING PRESCALER
2002 Microchip Technology Inc.
;are required only if
;Clear WDT
;Clear TMR0 & Prescaler
;PS<2:0> are 000 or
;001
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source
;desired
;desired WDT rate
this example