参数资料
型号: PIC10F222-I/OT
厂商: Microchip Technology
文件页数: 24/86页
文件大小: 0K
描述: IC PIC MCU FLASH 512X12 SOT-23-6
标准包装: 3,000
系列: PIC® 10F
核心处理器: PIC
芯体尺寸: 8-位
速度: 8MHz
外围设备: POR,WDT
输入/输出数: 4
程序存储器容量: 768B(512 x 12)
程序存储器类型: 闪存
RAM 容量: 23 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 2x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: SOT-23-6
包装: 散装
PIC10F220/222
DS41270E-page 28
2007 Microchip Technology Inc.
6.2.1
SWITCHING PRESCALER
ASSIGNMENT
The prescaler assignment is fully under software
control (i.e., it can be changed “on-the-fly” during pro-
gram execution). To avoid an unintended device Reset,
the following instruction sequence (Example 6-1) must
be executed when changing the prescaler assignment
from Timer0 to the WDT.
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0
→ WDT)
To change prescaler from the WDT to the Timer0
module, use the sequence shown in Example 6-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT
instruction
should
be
executed
before
switching the prescaler.
EXAMPLE 6-2:
CHANGING PRESCALER
(WDT
→TIMER0)
FIGURE 6-5:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
CLRWDT
;Clear WDT
CLRF
TMR0
;Clear TMR0 & Prescaler
MOVLW
‘00xx1111’b ;These 3 lines (5, 6, 7)
OPTION
;are required only if
;desired
CLRWDT
;PS<2:0> are 000 or 001
MOVLW
‘00xx1xxx’b ;Set Postscaler to
OPTION
;desired WDT rate
CLRWDT
;Clear WDT and
;prescaler
MOVLW
‘xxxx0xxx’
;Select TMR0, new
;prescale value and
;clock source
OPTION
TCY (= FOSC/4)
Sync
2
Cycles
TMR0 Reg
8-bit Prescaler
8-to-1 MUX
M
MUX
Watchdog
Timer
PSA(1)
0
1
0
1
WDT
Time-Out
PS<2:0>(1)
8
PSA(1)
WDT Enable bit
0
1
0
1
Data Bus
8
PSA(1)
T0CS(1)
M
U
X
M
U
X
U
X
T0SE(1)
GP2/T0CKI(2)
Pin
Note 1:
T0CS, T0SE, PSA, PS<2:0> are bits in the OPTION register.
2:
T0CKI is shared with pin GP2 on the PIC10F220/222.
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