AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 73

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

Interrupt Generator
4202D–SCR–06/05
Removal of the smart card will automatically start the power off sequence as described
in Figure 39.
The SCIB deactivation sequence after a reset of the CPU or after a lost of power supply
is ISO7816-3 compliant. The switching order of the signals is the same as in Figure 39
but the delay between signals is analog and not clock dependant.
Figure 39. SCIB Deactivation Sequence after a Card Extraction
There are several sources of interruption but the SCIB macro-cell issues only one inter-
rupt signal: SCIBIT.
Figure 40. SCIB Interrupt Sources
This signal is high level active. Each of the sources is able to activate the SCIB interrup-
tion which is cleared when the Smart Card Interrupt register is read by the
microcontroller.
If during the read of the Smart Card Interrupt register another interrupt occurs, the acti-
vation of the corresponding bit in the Smart Card Interrupt register and the new SCIB
interruption is delayed until the interrupt register is read by the microcontroller.
Warning : Each bit of the SCIIR register is irrelevant while the corresponding interrup-
tion is disabled in SCIER register. When the interruption mode is not used, the bits of
the SCISR register must be used instead of the bits of the SCIIR register.
CCLK
CRST
CIO
CVCC
Transmit buffer
copied to shift register
Output current
out of range
Complete
transmission
Output voltage
out of range
Timeout on WT
counter
Parity error
detected
Complete
reception
8 Clock Cycles
ESCPI
ICARDER
EVCARDER
ESCRI
ESCWTI
ESCTI
ESCTBI
VCARDERR
ICARDERR
SCWTI
SCTBI
SCRI
SCPI
SCTI
SCIB IT
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