tda8031hl-c107 NXP Semiconductors, tda8031hl-c107 Datasheet - Page 26

• Manufacturer Part Number: tda8031hl-c107
• Description: Usb Smart Card Reader Otp Or Rom
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 24 Description of the CCR bits
Table 25 CLK value for an asynchronous card
Note
1. If f
2003 Jul 04
USB smart card reader (OTP or ROM)
2 to 0
BIT
CLK
7
6
5
4
3
= f
AC2
0
0
0
0
1
1
1
1
XTAL
AC2 to AC0 When switching from
, the duty cycle must be ensured by the incoming clock signal on XTAL1.
SYMBOL
CST
SHL
SC
not used
not used
Stop HIGH or LOW: If bit CST = 1, then the clock is stopped at LOW level if SHL = 0
and at HIGH level if SHL = 1. In these modes, the bias current in the card drivers is
reduced; the current drawn by the card (I
voltages.
Clock stop: In case of asynchronous cards, bit CST defines whether the clock to the
card is stopped or not. If bit CST is reset, then the clock is determined by bits AC0,
AC1 and AC2; see Table 25. All frequency changes are synchronous, thus ensuring
that no spike or unwanted pulse widths occurs during changes.
Synchronous Clock: In the event of synchronous cards, the clock contact is a copy of
the value written in SC. In reception mode, the data from the card is available in bit UR0
after a read operation of the URR register. In transmission mode, bit UT0 is written on
the I/O line of the card when UTR register has been written.
AC1 and AC0 must remain the same. When switching from
or vice versa, only bits CST and SHL must be changed.
When switching from
between the command and the effective frequency change on pin CLK. The fastest
switch is from
vice versa. The status bit CLKSW within the MSR gives the effective switch moment.
AC1
0
0
1
1
0
0
1
1
1
2
f
xtal
to
1
1
n
n
1
f
f
xtal
2
xtal
f
int
to
26
to
or vice versa, the best duty cycle is from
1
1
2
2
f
f
int
int
AC0
or vice versa, a maximum delay of 200 s can occur
0
1
0
1
0
1
0
1
or vice versa, only bit AC2 must be changed;
DESCRIPTION
CC
) should be less than 10 mA at all V
TDA8030; TDA8031
1
n
f
xtal
or
CLK
1
1
1
1
1
1
1
f
Product specification
2
4
8
xtal
2
2
2
2
1
f
f
f
f
f
f
f
xtal
xtal
xtal
2
1
int
int
int
int
(1)
f
8
int
f
xtal
to CLK STOP
to
1
CC
2
f
int
or