PIC14000T-20I/SO Microchip Technology, PIC14000T-20I/SO Datasheet - Page 40
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PIC14000T-20I/SO
Manufacturer Part Number
PIC14000T-20I/SO
Description
IC MCU OTP 4KX14 A/D 28SOIC
Manufacturer
Microchip Technology
Series
PIC® 14r
Datasheets
1.PIC16LF627A-IP.pdf
(8 pages)
2.PIC16F818-ISO.pdf
(6 pages)
3.PIC14000-04SO.pdf
(153 pages)
4.PIC14000-04SO.pdf
(5 pages)
Specifications of PIC14000T-20I/SO
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C
Peripherals
POR, Temp Sensor, WDT
Number Of I /o
20
Program Memory Size
7KB (4K x 14)
Program Memory Type
OTP
Ram Size
192 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 6 V
Data Converters
Slope A/D
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-SOIC (7.5mm Width)
Data Bus Width
8 bit
Data Ram Size
192 B
Interface Type
SPI, UART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
22
Number Of Timers
1
Operating Supply Voltage
2.7 V to 6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
14 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
PIC14000
6.3.1
The prescaler assignment is fully under software
control, i.e., it can be changed “on the fly” during
program execution. To avoid an unintended device
RESET,
(Example 6-1) must be executed when changing the
prescaler assignment from Timer0 to WDT.
EXAMPLE 6-1:
10.BCF
TABLE 6-1:
TABLE 6-2:
DS40122B-page 40
TMR0
OPTION
INTCON
Legend: x = unknown,
Note 1: For reset values of registers in other reset situations refer to Table 10-4.
1.BCF
2.CLRWDT
3.CLRF
4.BSF
5.MOVLW '00101111'b;These 3 lines (5, 6, 7)
6.MOVWF OPTION
7.CLRWDT
8.MOVLW '00101xxx'b ;Set Postscaler to
9.MOVWF OPTION
Address
01h
0Bh/8Bh
81h
87h
Legend: r = Reserved locations
Register Name
SWITCHING PRESCALER ASSIGNMENT
Shaded boxes are not used by Timer0 module
the
STATUS,RP0
TMR0
STATUS, RP0 ;Bank 1
STATUS, RP0 ;Return to Bank 0
Name
TMR0
INTCON
OPTION
TRISC
SUMMARY OF TIMER0 REGISTERS
REGISTERS ASSOCIATED WITH TIMER0
following
CHANGING PRESCALER
(TIMER0 WDT)
Timer/counter register
Configuration and prescaler assign-
ment bits for TMR0.
TMR0 overflow interrupt flag and
mask bits.
TRISC7
RCPU
;Skip if already in
; Bank 0
;Clear WDT
;Clear TMR0 & Prescaler
; are required only
; if desired PS<2:0>
; are 000 or 001
; desired WDT rate
Bit 7
GIE
instruction
Function
TRISC6
PEIE
Bit 6
r
sequence
TRISC5
T0CS
Bit 5
T0IE
Preliminary
TIMER0 TIMER/COUNTER
TRISC4
T0SE
Bit 4
To change prescaler from the WDT to the Timer0
module use the sequence shown in Example 6-2. This
precaution must be taken even if the WDT is disabled.
EXAMPLE 6-2:
r
Address
CLRWDT
BSF
MOVLW
MOVWF
BCF
0Bh
01h
81h
TRISC3
Bit 3
PSA
r
STATUS, RP0
B'xxxx0xxx'
OPTION
STATUS, RP0
CHANGING PRESCALER
(WDT TIMER0)
TRISC2
Bit 2
T0IF
PS2
Power-on Reset Value
1996 Microchip Technology Inc.
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source
xxxx xxxx
1111 1111
0000 000x
TRISC1
Bit 1
PS1
r
TRISC0
Bit 0
PS0
r