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参数资料
型号： PIC16C554-20E/SO
厂商： Microchip Technology
文件页数： 41/108页
文件大小： 0K
描述： IC MCU OTP 512X14 18SOIC
标准包装： 42
系列： PIC® 16C
核心处理器： PIC
芯体尺寸： 8-位
速度： 20MHz
外围设备： POR，WDT
输入/输出数： 13
程序存储器容量： 896B（512 x 14）
程序存储器类型： OTP
RAM 容量： 80 x 8
电压 - 电源 (Vcc/Vdd)： 3 V ~ 5.5 V
振荡器型： 外部
工作温度： -40°C ~ 125°C
封装/外壳： 18-SOIC（0.295"，7.50mm 宽）
包装： 管件
PIC16C55X
DS40143D-page 36
Preliminary
2002 Microchip Technology Inc.
6.4
Power-on Reset (POR), Power-up
Timer (PWRT), Oscillator Start-up
Timer (OST)
6.4.1
POWER-ON RESET (POR)
A Power-on Reset pulse is generated on-chip when
V
DD rise is detected (in the range of 1.6V – 1.8V). To
take advantage of the POR, just tie the MCLR pin
through a resistor to V
DD. This will eliminate external
RC components usually needed to create Power-on
Reset. A maximum rise time for V
DD is required. See
Electrical Specifications for details.
The POR circuit does not produce internal RESET
when V
DD declines.
When the device starts normal operation (exits the
RESET condition), device operating parameters (volt-
age, frequency, temperature, etc.) must be met to
ensure operation. If these conditions are not met, the
device must be held in RESET until the operating con-
ditions are met.
For additional information, refer to Application Note
AN607 “Power-up Trouble Shooting”.
6.4.2
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms (nominal)
timeout on power-up only, from POR. The Power-up
Timer operates on an internal RC oscillator. The chip is
kept in RESET as long as PWRT is active. The PWRT
delay allows the V
DD to rise to an acceptable level. A
configuration bit, PWRTE can disable (if set) or enable
(if cleared or programmed) the Power-up Timer. The
Power-Up Time delay will vary from chip to chip and
due to V
DD, temperature and process variation. See
DC parameters for details.
6.4.3
OSCILLATOR START-UP TIMER
(OST)
The Oscillator Start-Up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over. This ensures that the crystal
oscillator or resonator has started and stabilized.
The OST timeout is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
SLEEP.
6.4.4
TIMEOUT SEQUENCE
On power-up, the timeout sequence is as follows: First
PWRT timeout is invoked after POR has expired, then
OST is activated. The total timeout will vary based on
oscillator configuration and PWRTE bit status. For
example, in RC mode with PWRTE bit erased (PWRT
disabled), there will be no timeout at all. Figure 6-7,
Figure 6-8 and Figure 6-9 depict timeout sequences.
Since the timeouts occur from the POR pulse, if MCLR
is kept low long enough, the timeouts will expire. Then
bringing MCLR high will begin execution immediately
(see Figure 6-8). This is useful for testing purposes or
to synchronize more than one PIC16C55X device oper-
ating in parallel.
Table 6-5 shows the RESET conditions for some spe-
cial registers, while Table 6-6 shows the RESET condi-
tions for all the registers.
相关PDF资料
PDF描述
PIC16C554-20E/P IC MCU OTP 512X14 18DIP
CC-56K2-IP MODEM 56KBAUD PARALLEL 3.3V
VE-263-IX-F2 CONVERTER MOD DC/DC 24V 75W
CC-33K2-IP MODEM 33KBAUD PARALLEL 3.3V
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相关代理商/技术参数
参数描述
PIC16C554-20I/P 功能描述:8位微控制器 -MCU .875KB 80 RAM 13 I/O 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
PIC16C554-20I/SO 功能描述:8位微控制器 -MCU .875KB 80 RAM 13 I/O 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
PIC16C554-20I/SS 功能描述:8位微控制器 -MCU .875KB 80 RAM 13 I/O 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
PIC16C554T-04/SO 功能描述:8位微控制器 -MCU .875KB 80 RAM 13 I/O 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
PIC16C554T-04/SS 功能描述:8位微控制器 -MCU .875KB 80 RAM 13 I/O 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
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