89C5121-SK1 Atmel, 89C5121-SK1 Datasheet - Page 34
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89C5121-SK1
Manufacturer Part Number
89C5121-SK1
Description
KIT SMART CARD FOR AT89C5121
Manufacturer
Atmel
Type
Smart Cardr
Datasheet
1.89C5121-SK1.pdf
(115 pages)
Specifications of 89C5121-SK1
Contents
Board
For Use With/related Products
AT89C5121
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
T89C5121-SK1
T89C5121-SK1
T89C5121-SK1
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Interrupt Generator
Registers
34
A/T8xC5121
There are several sources of interruption but the SCIB macro-cell issues only one inter-
rupt signal: SCIB IT.
Figure 20. SCIB Interrupt Sources
This signal is high level active. One of the sources is able to set up the interrupt signal
and this is the read of the Smart Card Interrupt register by the CPU that clears this
signal.
If during the read of the Smart Card Interrupt register an interrupt occurs, the set of the
corresponding bit into the Smart Card Interrupt register and the set of the interrupt signal
will be delayed after the read access.
There are fourteen registers to control the SCIB macro-cell. They will be described in
the Section “DC/DC Converter”.
Some of the register widths are greater than a byte. Despite the 8 bits access provided
by the BIU, the address mapping of this kind of register respects the following rule:
•
This implementation makes access to these registers easier when using high level pro-
gramming language (C,C++).
The Lowest significant byte register is implemented at the higher address.
Transmit buffer
copied to shift register
Output current
out of range
Output voltage
out of range
Timeout on WT
counter
Complete
transmission
Parity error
detected
Complete
reception
CIccER
ECVccER
ESCPI
ESCRI
ESCWTI
ESCTI
ESCTBI
SCIB IT
4164G–SCR–07/06
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