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参数资料
型号： RFPIC12F675F-I/SS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO20
封装： 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数： 46/123页
文件大小： 5438K
代理商： RFPIC12F675F-I/SS
2003 Microchip Technology Inc.
Preliminary
DS70091A-page 27
rfPIC12F675
4.4
Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module, or as a postscaler for the Watchdog
Timer. For simplicity, this counter will be referred to as
“prescaler” throughout this Data Sheet. The prescaler
assignment is controlled in software by the control bit
PSA (OPTION_REG<3>). Clearing the PSA bit will
assign the prescaler to Timer0. Prescale values are
selectable via the PS2:PS0 bits (OPTION_REG<2:0>).
The prescaler is not readable or writable. 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 Watchdog Timer.
4.4.1
SWITCHING PRESCALER
ASSIGNMENT
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,
the
following
instruction
sequence
(Example 4-1) must be executed when changing the
prescaler assignment from Timer0 to WDT.
EXAMPLE 4-1:
CHANGING PRESCALER
(TIMER0
→WDT)
To change prescaler from the WDT to the TMR0
module, use the sequence shown in Example 4-2. This
precaution must be taken even if the WDT is disabled.
EXAMPLE 4-2:
CHANGING PRESCALER
(WDT
→TIMER0)
TABLE 4-1:
REGISTERS ASSOCIATED WITH TIMER0
bcf
STATUS,RP0
;Bank 0
clrwdt
;Clear WDT
clrf
TMR0
;Clear TMR0 and
; prescaler
bsf
STATUS,RP0
;Bank 1
movlw
b’00101111’ ;Required if desired
movwf
OPTION_REG
; PS2:PS0 is
clrwdt
; 000 or 001
;
movlw
b’00101xxx’ ;Set postscaler to
movwf
OPTION_REG
; desired WDT rate
bcf
STATUS,RP0
;Bank 0
clrwdt
;Clear WDT and
; postscaler
bsf
STATUS,RP0
;Bank 1
movlw
b’xxxx0xxx’ ;Select TMR0,
; prescale, and
; clock source
movwf
OPTION_REG
;
bcf
STATUS,RP0
;Bank 0
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOD
Value on
all other
RESETS
01h
TMR0
Timer0 Module Register
xxxx xxxx uuuu uuuu
0Bh/8Bh
INTCON
GIE
PEIE
T0IE
INTE
GPIE
T0IF
INTF
GPIF
0000 0000 0000 000u
81h
OPTION_REG
GPPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111 1111 1111
85h
TRISIO
—
TRISIO5 TRISIO4 TRISIO3 TRISIO2 TRISIO1 TRISIO0
--11 1111 --11 1111
Legend:
— = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown.
Shaded cells are not used by the Timer0 module.
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相关代理商/技术参数
参数描述
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RFPIC12F675H 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:20-Pin FLASH-Based 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter
RFPIC12F675H-I/SS 功能描述:射频微控制器 - MCU 1KB Flash FSK ASK RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:Si100x 数据总线宽度:8 bit 最大时钟频率:24 MHz 程序存储器大小:64 KB 数据 RAM 大小:4 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LGA-42 安装风格:SMD/SMT 封装:Tube
RFPIC12F675HT-I/SS 功能描述:射频微控制器 - MCU 1KB Flash FSK ASK RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:Si100x 数据总线宽度:8 bit 最大时钟频率:24 MHz 程序存储器大小:64 KB 数据 RAM 大小:4 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LGA-42 安装风格:SMD/SMT 封装:Tube
RFPIC12F675K 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:20-Pin FLASH-Based 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter
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