参数资料
型号: MCHC705JJ7CPE
厂商: Freescale Semiconductor
文件页数: 104/164页
文件大小: 0K
描述: IC MCU 8BIT 224 BYTES RAM 20PDIP
标准包装: 18
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 2.1MHz
连通性: SIO
外围设备: POR,温度传感器,WDT
输入/输出数: 14
程序存储器容量: 6KB(6K x 8)
程序存储器类型: OTP
RAM 容量: 224 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 4x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-DIP(0.300",7.62mm)
包装: 管件
Resets
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
44
Freescale Semiconductor
5.2 Power-On Reset
A positive transition on the VDD pin generates a power-on reset. The power-on reset is strictly for
conditions during powering up and cannot be used to detect drops in power supply voltage.
A delay of 16 or 4064 internal bus cycles (tcyc) after the oscillator becomes active allows the clock
generator to stabilize. If the RESET pin is at logic 0 at the end of this multiple tcyc time, the MCU remains
in the reset condition until the signal on the RESET pin goes to a logic 1.
5.3 External Reset
A logic 0 applied to the RESET pin for a minimum of one and one half tcyc generates an external reset.
This pin is connected to a Schmitt trigger input gate to provide an upper and lower threshold voltage
separated by a minimum amount of hysteresis. The external reset occurs whenever the RESET pin is
pulled below the lower threshold and remains in reset until the RESET pin rises above the upper
threshold. This active low input will generate the internal RST signal that resets the CPU and peripherals.
The RESET pin can also be pulled to a low state by an internal pulldown device that is activated by three
internal reset sources. This reset pulldown device will only be asserted for three to four cycles of the
internal bus or as long as the internal reset source is asserted.
NOTE
Do not connect the RESET pin directly to VDD, as this may overload some
power supply designs if the internal pulldown on the RESET pin should
activate. If an external reset function is not required, the RESET pin should
be left unconnected.
5.4 Internal Resets
The four internally generated resets are:
Initial power-on reset (POR) function
COP watchdog timer reset
Low-voltage reset (LVR)
Illegal address detector
Only the COP watchdog timer reset, low-voltage reset, and illegal address detector will also assert the
pulldown device on the RESET pin for the duration of the reset function or for three to four internal bus
cycles, whichever is longer.
5.4.1 Power-On Reset (POR)
The internal POR is generated on power-up to allow the clock oscillator to stabilize. The POR is strictly
for power turn-on conditions and is not able to detect a drop in the power supply voltage (brown-out); that
function can be performed by the LVR. Depending on the DELAY bit in the mask option register (MOR),
there is an oscillator stabilization delay of 16 or 4064 internal bus cycles after the LPO becomes active.
The POR will generate the RST signal which will reset the CPU. If any other reset function is active at the
end of the 16- or 4064-cycle delay, the RST signal will remain in the reset condition until the other reset
condition(s) end.
POR will not activate the pulldown device on the RESET pin. VDD must drop below VPOR for the internal
POR circuit to detect the next rise of VDD.
相关PDF资料
PDF描述
VI-B4L-IX-B1 CONVERTER MOD DC/DC 28V 75W
VI-B4K-IW-B1 CONVERTER MOD DC/DC 40V 100W
VI-B4J-IX-B1 CONVERTER MOD DC/DC 36V 75W
VI-B4J-IW-B1 CONVERTER MOD DC/DC 36V 100W
VI-B43-IX-B1 CONVERTER MOD DC/DC 24V 75W
相关代理商/技术参数
参数描述
MCHC705JP7CDWE 功能描述:8位微控制器 -MCU 8B MCU 224 BYTES 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
MCHC705KJ1CDWE 功能描述:8位微控制器 -MCU 8 BIT MCU 64 BYTES 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
MCHC705KJ1CDWE 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
MCHC705KJ1CPE 功能描述:IC MCU 8BIT 64 BYTES RAM 16PDIP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:HC05 标准包装:1 系列:87C 核心处理器:MCS 51 芯体尺寸:8-位 速度:16MHz 连通性:SIO 外围设备:- 输入/输出数:32 程序存储器容量:8KB(8K x 8) 程序存储器类型:OTP EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4 V ~ 6 V 数据转换器:- 振荡器型:外部 工作温度:0°C ~ 70°C 封装/外壳:44-DIP 包装:管件 其它名称:864285
MCHC711KS2CFNE3 功能描述:8位微控制器 -MCU 32K EPROM - SLO MODE 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