參數(shù)資料
型號(hào)： HPC46100
廠商： National Semiconductor Corporation
英文描述： HPC46100 High-Performance microController with DSP Capability
中文描述： HPC46100高性能微控制器與DSP處理能力
文件頁(yè)數(shù)： 18/32頁(yè)
文件大小： 436K
代理商： HPC46100
AD Converter (Continued)
Source impedances greater than 1 kX on the analog input
lines will adversely affect internal RC charging time during
input sampling As shown in
Figure 28 the analog switch to
the DAC array is closed only during the 2 AD cycle sample
time Large source impedances on the analog inputs may
result in the DAC array not being charged to the correct
voltage levels causing scale errors
If large source resistance is necessary the recommended
solution is to slow down the AD clock speed in proportion
to the source resistance The AD converter may be operat-
ed at the maximum speed for RS less than 1 kX For RS
greater than 1 kX AD clock speed needs to be reduced
For example with RS e 2kX the AD converter may be
operated at half the maximum speed AD converter clock
speed may be slowed down by either increasing the AD
prescaler divide-by or decreasing the CKI clock frequency
The AD clock speed may be reduced to its minimum fre-
quency of 100 kHz
Shared Memory Support
Shared memory access provides a rapid technique to ex-
change data It is effective when data is moved from a pe-
ripheral to memory or when data is moved between blocks
of memory A related area where shared memory access
proves effective is in multiprocessing applications where
two CPUs share a common memory block (see
Figure 29 )
The HPC46100 supports shared memory access with two
pins The pins are the RDYHLD input pin and the HLDA
output pin The user can software select either the Hold or
Ready function by the state of a control bit The HLDA out-
put is multiplexed onto port B
The host uses DMA to interface with the HPC46100 The
host initiates a data transfer by activating the HLD input of
the HPC46100 In response the HPC46100 places its sys-
tem bus in a TRI-STATE Mode freeing it for use by the host
TLDD11289 – 31
FIGURE 29 Shared Memory Application Using HOLD
25
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