参数资料
型号: PIC16C505-04/SL
厂商: Microchip Technology
文件页数: 18/90页
文件大小: 0K
描述: IC MCU OTP 1KX12 14SOIC
产品培训模块: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装: 57
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
外围设备: POR,WDT
输入/输出数: 11
程序存储器容量: 1.5KB(1K x 12)
程序存储器类型: OTP
RAM 容量: 72 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 14-SOIC(0.154",3.90mm 宽)
包装: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1086-ND - ADAPTER 14-ZIF BD W/14-SO PLUGS
309-1085-ND - ADAPTER 14-DIP BD W/2 14-SO PLUG
309-1001-ND - ADAPTER 14-SOIC TO 14-DIP
309-1000-ND - ADAPTER 14-SOIC TO 14-DIP
1999-2012 Microchip Technology Inc.
DS40192D-page 25
PIC16C505
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
requirement is due to internal phase clock (TOSC)
synchronization. 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
accomplished 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 20 ns)
and low for at least 2TOSC (and a small RC delay of
20 ns). 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
requirement, 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
40 ns) 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
10 ns. Refer to parameters 40, 41 and 42 in the
electrical specification of the desired device.
6.1.2
TIMER0 INCREMENT DELAY
Since the prescaler output is synchronized with the
internal clocks, there is a small delay from the time the
external clock edge occurs to the time the Timer0
module is actually incremented. Figure 6-4 shows the
delay from the external clock edge to the timer
incrementing.
FIGURE 6-4:
TIMER0 TIMING WITH EXTERNAL CLOCK
Increment Timer0 (Q4)
External Clock Input or
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Timer0
T0
T0 + 1
T0 + 2
Small pulse
misses sampling
External Clock/Prescaler
Output After Sampling
(3)
Note 1:
2:
3:
Delay from clock input change to Timer0 increment is 3Tosc to 7Tosc. (Duration of Q = Tosc).
Therefore, the error in measuring the interval between two edges on Timer0 input =
4Tosc max.
External clock if no prescaler selected; prescaler output otherwise.
The arrows indicate the points in time where sampling occurs.
Prescaler Output (2)
(1)
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PIC16C505-20/P 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 20MHz PDIP14 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
PIC16C505-20/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 20MHz SOIC14 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
PIC16C505-20E/P 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 20MHz ExtTemp PDIP14 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
PIC16C505-20E/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 20MHz ExtTemp SOIC14 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
PIC16C505-20I/P 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 20MHz IndTemp PDIP14 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