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AM188EM-20VIW 参数 Datasheet PDF下载

AM188EM-20VIW图片预览
型号: AM188EM-20VIW
PDF下载: 下载PDF文件 查看货源
内容描述: 8位/ 16位微控制器 [8-Bit/16-Bit Microcontrollers]
分类和应用: 微控制器
文件页数/大小: 146 页 / 1574 K
品牌: INNOVASIC [ INNOVASIC, INC ]
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IA186EM/IA188EM  
Data Sheet  
8-Bit/16-Bit Microcontrollers  
February 25, 2011  
end of the timer interrupt routine being serviced, set the Interrupt Enable Bit in the Process  
Status Word to globally disable interrupts prior to clearing the timer interrupt being serviced and  
unmask the appropriate timer interrupts.  
Errata No. 2  
Problem: Lock up just after reset is released.  
Description: Usually the first instruction is a long jump to the start of the user’s code. In this  
case, the compiler apparently inserted a short jump instruction with zero displacement before the  
expected long jump instruction. The OEM device stuttered, but recovered to execute the long  
jump, while the device instruction pointer was corrupted, causing the lockup. In summary, a  
short jump with zero displacement is a corner case that does not work in the device.  
Workaround: Do not use a short jump instruction with zero displacement.  
Errata No. 3  
Problem: Intermittent startup.  
Description: Processor either came out of reset normally, or would go into a series of watchdog  
timeouts. The addition of 10K ohm pullups to the wr_n and rd_n outputs seemed to solve the  
issue. Further analysis of the OEM device shows the presence of undocumented pullups on these  
pins, which will pull them high when the reset condition tristates these pins. The device does not  
include internal pullups on these pins allowing these outputs to float during reset.  
Workaround: Add 10K ohm pullups to wr_n and rd_n pins to guarantee proper logic levels at  
the end of reset.  
Errata No. 4  
Problem: Timer operation in continuous mode.  
Description: The timers (Timer 0 and Timer 1) do not function per the specification when set in  
continuous mode with no external timer input stimulus to initiate/continue count.  
Workaround: None.  
Errata No. 5  
Problem: DMA interrupt will not bring device out of halt state.  
®
IA211050831-19  
UNCONTROLLED WHEN PRINTED OR COPIED  
http://www.Innovasic.com  
Customer Support:  
Page 143 of 146  
1-888-824-4184  
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