73s1217f68im Maxim Integrated Products, Inc., 73s1217f68im Datasheet - Page 100

• Manufacturer Part Number: 73s1217f68im
• Description: Bus-powered 80515 System-on-chip With Usb, Iso 7816 / Emv, Pinpad And More
• Manufacturer: Maxim Integrated Products, Inc.

used for C4, C8 functions if necessary.
External Smart Card Control Register (SCECtl): 0xFE0B
This register is used to directly set and sample signals of External Smart Card interface. There are three
modes of asynchronous operation, an “automatic sequence” mode, and bypass mode. Clock stop per
the ISO 7816-3 interface is also supported but firmware must handle the protocol for SIO and SCLK for
I
should be handled via the I
100
2
C clock stop and start. Control for Reset (to make RST signal), activation control, voltage select, etc.
MSB
SCECtl.7
SCECtl.6
SCECtl.5
SCECtl.4
SCECtl.3
SCECtl.2
SCECtl.1
SCECtl.0
Bit
–
SCLKOFF
SCLKLVL
Symbol
SIOD
–
SIO
–
–
–
–
2
C interface when using external 73S73S8010x devices. USR(n) pins shall be
SIO
External Smart Card I/O. Bit when read indicates state of pin SIO for
SIOD = 1 (Caution, this signal is not synchronized to the MPU clock), when
written, sets the state of pin SIO for SIOD = 0. Ignored if not in bypass or
sync modes. In sync mode, this bit will contain the value of IO pin on the
latest rising edge of SCLK.
1 = input, 0 = output. External Smart Card I/O Direction control. Ignored if
not in bypass or sync modes.
Sets the state of SCLK when disabled by SCLKOFF bit. If in bypass mode,
this bit directly controls the state of SCLK.
0 = SCLK enabled, 1 = SCLK disabled. When disabled, SCLK level is
determined by SCLKLVL. This bit has no effect if in bypass mode.
Table 90: The SCECtl Register
SIOD
–
Function
0x00
–
SCLKLVL SCLKOFF
LSB
Rev. 1.2