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| 型号： | PIC10F222T-E/OT |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, RISC MICROCONTROLLER, PDSO6 |
| 封装： | LEAD FREE, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 21/80页 |
| 文件大小： | 1069K |
| 代理商： | PIC10F222T-E/OT |
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PIC10F220/222
DS41270D-page 26
Preliminary
2007 Microchip Technology Inc.
FIGURE 6-3:
TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2
TABLE 6-1:
REGISTERS ASSOCIATED WITH TIMER0
6.1
Using Timer0 With An External
Clock
When an external clock input is used for Timer0, it must
meet certain requirements. The external clock require-
ment is due to internal phase clock (TOSC) synchroniza-
tion. Also, there is a delay in the actual incrementing of
Timer0 after synchronization.
6.1.1
EXTERNAL CLOCK
SYNCHRONIZATION
When no prescaler is used, the external clock input is
the same as the prescaler output. The synchronization
of T0CKI with the internal phase clocks is accom-
plished by sampling the prescaler output on the Q2 and
Q4 cycles of the internal phase clocks (Figure 6-4).
Therefore, it is necessary for T0CKI to be high for at
least 2TOSC (and a small RC delay of 2Tt0H) and low
for at least 2TOSC (and a small RC delay of 2Tt0H).
Refer to the electrical specification of the desired
device.
When a prescaler is used, the external clock input is
divided by the asynchronous ripple counter-type
prescaler, so that the prescaler output is symmetrical.
For the external clock to meet the sampling require-
ment, the ripple counter must be taken into account.
Therefore, it is necessary for T0CKI to have a period of
at least 4TOSC (and a small RC delay of 4Tt0H) divided
by the prescaler value. The only requirement on T0CKI
high and low time is that they do not violate the
minimum pulse width requirement of Tt0H. Refer to
parameters 40, 41 and 42 in the electrical specification
of the desired device.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-On
Reset
Value on
All Other
Resets
01h
TMR0
Timer0 – 8-Bit Real-Time Clock/Counter
xxxx xxxx
uuuu uuuu
N/A
OPTION
GPWU
GPPU
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
N/A
TRISGPIO(1)
—
I/O Control Register
---- 1111
Legend:
Shaded cells not used by Timer0, – = unimplemented, x = unknown, u = unchanged.
Note 1:
The TRIS of the T0CKI pin is overridden when T0CS = 1
PC-1
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Q1 Q2 Q3 Q4
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Instruction
Fetch
Timer0
PC
PC + 1
PC + 2
PC + 3
PC + 4
PC + 6
T0
T0 + 1
NT0
NT0 + 1
MOVWF TMR0
MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W
MOVF TMR0,W
Write TMR0
executed
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0 + 1
Read TMR0
reads NT0 + 2
Instruction
Executed
PC + 5
PC
(Program
Counter)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC10F222TI/MC | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F222T-I/MC | 功能描述:8位微控制器 -MCU 0.75KB 23B RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 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 + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC10F222TI/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F222T-I/OT | 功能描述:8位微控制器 -MCU 768 B FL 16 RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 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 + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC10F222T-I/OT | 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC |
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