73s1217f68im Maxim Integrated Products, Inc., 73s1217f68im Datasheet - Page 93

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

V
A programmable timer is provided to set the time from activation start (setting the VCCSEL.1 and
VCCSEL.0 bits to non-zero) to when VCC_OK is evaluated. VCC_OK must be true at the end of this
timers programmed interval (tto in
is not true and the end of the interval (tto), the Card Event interrupt will be set, and a deactivation
sequence shall begin including clearing of the VCCSEL bits.
MSB
Rev. 1.2
OFFTMR.3 OFFTMR.2 OFFTMR.1 OFFTMR.0 VCCTMR.3 VCCTMR.2 VCCTMR.1 VCCTMR.0
CC
VccTmr.7
VccTmr.6
VccTmr.5
VccTmr.4
VccTmr.3
VccTmr.2
VccTmr.1
VccTmr.0
Stable Timer Register (VccTmr): 0xFE04
Bit
VCCTMR.3
VCCTMR.2
VCCTMR.1
VCCTMR.0
OFFTMR.3
OFFTMR.2
OFFTMR.1
OFFTMR.0
Symbol
VCC Off Timer – The bits set the delay (in number of ETUs) for
deactivation after the VCCSEL.1 and VCC SEL.0 have been set to 0.
The time value is a count of the 32768Hz clock and is given by tto =
OFFTMR(7:4) * 30.5μs. This delay does not affect emergency
deactivations due to VDD Fault or card events. A value of 0000 results in
no additional delay.
VCC Timer – VCCOK must be true at the time set by the value in these
bits in order for the activation sequence to continue. If not, the VCCSEL
bits will be cleared. The time value is a count of the 32768Hz clock and
is given by tto = VCCTMR(3:0) * 30.5μs. A value of 0000 results in no
timeout, not zero time, and activation requires that RDYST is set and
RDY goes high.
Figure
Table 83: The VccTmr Register
18) in order for the activation sequence to continue. If VCC_OK
0x0F
Function
LSB
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