MCP1631RD-MCC2 Microchip Technology, MCP1631RD-MCC2 Datasheet - Page 76
![REFERENCE DESIGN MCP1631HV](/photos/9/4/90424/mcp1631rd-mcc2_sml.jpg)
MCP1631RD-MCC2
Manufacturer Part Number
MCP1631RD-MCC2
Description
REFERENCE DESIGN MCP1631HV
Manufacturer
Microchip Technology
Datasheets
1.MCP1631VHVT-330EST.pdf
(34 pages)
2.MCP1631HV-330EST.pdf
(54 pages)
3.MCP1631RD-MCC2.pdf
(20 pages)
4.MCP1631RD-MCC2.pdf
(328 pages)
Specifications of MCP1631RD-MCC2
Main Purpose
Power Management, Battery Charger
Embedded
Yes, MCU, 8-Bit
Utilized Ic / Part
MCP1631HV, PIC16F883
Primary Attributes
1 ~ 2 Cell- Li-Ion, 1 ~ 5 Cell- NiCd/NiMH, 1 ~ 2 1W LEDs
Secondary Attributes
Status LEDs
Silicon Manufacturer
Microchip
Application Sub Type
Battery Charger
Kit Application Type
Power Management - Battery
Silicon Core Number
MCP1631HV, PIC16F883
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- MCP1631VHVT-330EST PDF datasheet
- MCP1631HV-330EST PDF datasheet #2
- MCP1631RD-MCC2 PDF datasheet #3
- MCP1631RD-MCC2 PDF datasheet #4
- Current page: 76 of 328
- Download datasheet (6Mb)
PIC16F882/883/884/886/887
5.1.3
A single software programmable prescaler is available
for use with either Timer0 or the Watchdog Timer
(WDT), but not both simultaneously. The prescaler
assignment is controlled by the PSA bit of the OPTION
register. To assign the prescaler to Timer0, the PSA bit
must be cleared to a ‘0’.
There are 8 prescaler options for the Timer0 module
ranging from 1:2 to 1:256. The prescale values are
selectable via the PS<2:0> bits of the OPTION register.
In order to have a 1:1 prescaler value for the Timer0
module, the prescaler must be assigned to the WDT
module.
The prescaler is not readable or writable. When
assigned to the Timer0 module, all instructions writing to
the TMR0 register will clear the prescaler.
When the prescaler is assigned to WDT, a CLRWDT
instruction will clear the prescaler along with the WDT.
5.1.3.1
As a result of having the prescaler assigned to either
Timer0 or the WDT, it is possible to generate an
unintended device Reset when switching prescaler
values. When changing the prescaler assignment from
Timer0 to the WDT module, the instruction sequence
shown in Example 5-1, must be executed.
EXAMPLE 5-1:
DS41291F-page 74
BANKSEL
CLRWDT
CLRF
BANKSEL
BSF
CLRWDT
MOVLW
ANDWF
IORLW
MOVWF
SOFTWARE PROGRAMMABLE
PRESCALER
TMR0
TMR0
OPTION_REG
OPTION_REG,PSA
b’11111000’
OPTION_REG,W
b’00000101’
OPTION_REG
Switching Prescaler Between
Timer0 and WDT Modules
CHANGING PRESCALER
(TIMER0 → WDT)
;
;Clear WDT
;Clear TMR0 and
;prescaler
;
;Select WDT
;
;
;Mask prescaler
;bits
;Set WDT prescaler
;to 1:32
When changing the prescaler assignment from the
WDT to the Timer0 module, the following instruction
sequence must be executed (see Example 5-2).
EXAMPLE 5-2:
5.1.4
Timer0 will generate an interrupt when the TMR0
register overflows from FFh to 00h. The T0IF interrupt
flag bit of the INTCON register is set every time the
TMR0 register overflows, regardless of whether or not
the Timer0 interrupt is enabled. The T0IF bit must be
cleared in software. The Timer0 interrupt enable is the
T0IE bit of the INTCON register.
5.1.5
When Timer0 is in Counter mode, the synchronization
of the T0CKI input and the Timer0 register is accom-
plished by sampling the prescaler output on the Q2 and
Q4 cycles of the internal phase clocks. Therefore, the
high and low periods of the external clock source must
meet the timing requirements as shown in the
Section 17.0 “Electrical Specifications”.
CLRWDT
BANKSEL OPTION_REG
MOVLW
ANDWF
IORLW
MOVWF
Note:
b’11110000’
OPTION_REG,W ;prescaler bits
b’00000011’
OPTION_REG
TIMER0 INTERRUPT
The Timer0 interrupt cannot wake the
processor from Sleep since the timer is
frozen during Sleep.
USING TIMER0 WITH AN
EXTERNAL CLOCK
CHANGING PRESCALER
(WDT → TIMER0)
© 2009 Microchip Technology Inc.
;Clear WDT and
;prescaler
;
;Mask TMR0 select and
;Set prescale to 1:16
;
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