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15.5
External Chip Control Signal
An AFE interface is capable of transmitting the three external chip control signals of RESETO#,
PWRDWNO# and HC1. The output for each of the signals is individually controlled by the
corresponding bits in CRT. For the two signals of CNT1 (RESETO#) and CNT2 (PWRDWNO#),
the values set in CTR are output without delay. HC1, on the other hand, is output when the data
transfer finishes (point A of figure 15-3) immediately after the HC1 bit is set to 1. After a data is
successfully transferred into a control data (point B of figure 15-3), the output value of HC1 output
is 0 and the bit in CTR is cleared to 0 (see figure 15-3).
Note that the HC1 bit can be used for the HC1 pin in STL7546 of SGS Thomson.
FS
A
B
DIN
data
data
data
Control
(TxD)
HC1 bit
HC1 Pin
Figure 15.3 HC1 Pin and Control Data Outputs
Rev. 3.0, 03/01, page 240 of 390
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