欢迎访问ic37.com |
会员登录 免费注册
发布采购

Z8F082ASH020SC 参数 Datasheet PDF下载

Z8F082ASH020SC图片预览
型号: Z8F082ASH020SC
PDF下载: 下载PDF文件 查看货源
内容描述: Z8喝采XP -R F08xA系列与扩展外设 [Z8 Encore XP-R F08xA Series with eXtended Peripherals]
分类和应用: 微控制器和处理器外围集成电路光电二极管时钟
文件页数/大小: 244 页 / 2750 K
品牌: ZILOG [ ZILOG, INC. ]
 浏览型号Z8F082ASH020SC的Datasheet PDF文件第34页浏览型号Z8F082ASH020SC的Datasheet PDF文件第35页浏览型号Z8F082ASH020SC的Datasheet PDF文件第36页浏览型号Z8F082ASH020SC的Datasheet PDF文件第37页浏览型号Z8F082ASH020SC的Datasheet PDF文件第39页浏览型号Z8F082ASH020SC的Datasheet PDF文件第40页浏览型号Z8F082ASH020SC的Datasheet PDF文件第41页浏览型号Z8F082ASH020SC的Datasheet PDF文件第42页  
Z8 Encore! XP® F08xA Series  
Product Specification  
20  
Table 8. Reset and STOP Mode Recovery Characteristics and Latency (Continued)  
Reset Characteristics and Latency  
eZ8  
Reset Type  
Control Registers  
CPU Reset Latency (Delay)  
STOP Mode Recovery  
Unaffected, except  
WDT_CTL and  
Reset 66 Internal Precision Oscillator Cycles  
OSC_CTL registers  
STOP Mode Recovery with Unaffected, except  
Crystal Oscillator Enabled WDT_CTL and  
OSC_CTL registers  
Reset 5000 Internal Precision Oscillator Cycles  
During a System Reset or STOP Mode Recovery, the Internal Precision Oscillator requires  
4 µs to start up. Then, the Z8 Encore! XP® F08xA Series device is held in Reset for 66  
cycles of the Internal Precision Oscillator. If the crystal oscillator is enabled in the Flash  
option bits, this reset period is increased to 5000 IPO cycles. When a reset occurs because  
of a low voltage condition or power on reset, this delay is measured from the time that the  
supply voltage first exceeds the POR level (discussed later in this chapter). If the external  
pin reset remains asserted at the end of the reset period, the device remains in reset until  
the pin is deasserted.  
At the beginning of Reset, all GPIO pins are configured as inputs with pull-up resistor dis-  
abled, except PD0 which is shared with the reset pin. On reset, the Port D0 pin is config-  
ured as a bidirectional open-drain reset. The pin is internally driven low during port reset,  
after which the user code may reconfigure this pin as a general purpose output.  
During Reset, the eZ8 CPU and on-chip peripherals are idle; however, the on-chip crystal  
oscillator and Watch-Dog Timer oscillator continue to run.  
Upon Reset, control registers within the Register File that have a defined Reset value are  
loaded with their reset values. Other control registers (including the Stack Pointer, Regis-  
ter Pointer, and Flags) and general-purpose RAM are undefined following Reset. The eZ8  
CPU fetches the Reset vector at Program Memory addresses 0002Hand 0003Hand loads  
that value into the Program Counter. Program execution begins at the Reset vector  
address.  
Because the control registers are re-initialized by a system reset, the system clock after  
reset is always the IPO. User software must reconfigure the oscillator control block, such  
that the correct system clock source is enabled and selected.  
Reset Sources  
Table 9 lists the possible sources of a system reset.  
PS024705-0405  
P R E L I M I N A R Y  
Reset and STOP Mode Recovery