參數(shù)資料
型號(hào)： TDA8031
廠商： NXP Semiconductors N.V.
英文描述： USB smart card reader (OTP or ROM)
中文描述： USB智能卡閱讀器（OTP或光盤）
文件頁(yè)數(shù)： 23/57頁(yè)
文件大?。?/td> 228K
代理商： TDA8031
2003 Jul 04
23
Philips Semiconductors
Product specification
USB smart card reader (OTP or ROM)
TDA8030; TDA8031
Table 19
Description of the UCR2 bits
BIT
SYMBOL
DESCRIPTION
27
ENINT1
Enable Interrupt 1: If bit ENINT1 = 1, then a HIGH-to-LOW transition on INT1 will
wake-up the microcontroller from power-down mode. When not in power-down mode,
bit ENINT1 has no effect.
Disable TBE/RBF interrupts: If bit DISTBE/RBF = 1, then reception or transmission of a
character will not generate an interrupt. This feature is useful for increasing
communication speed with the card; in this case, the copy of TBE/RBF bit within the
MSR must be polled and not the original, in order not to loose priority interrupts which
can occur in the USR.
not used
not used
Synchronous/Asynchronous: Bit SAN is set by software if a synchronous card is
expected. Then, the UART is bypassed and only bit 0 in the URR and UTR is connected
to the I/O. In this case, the clock is controlled by bit SC in the CCR.
AUTOCONV Auto convention: If bit AUTOCONV = 1, then the convention is set by software with bit
CONV in the UART Configuration Register. If it is reset, then the configuration is
automatically detected on the first received character while the bit SS (Start Session) is
set.
CKU
Clock UART: Bit CKU is used to clock the UART at twice the clock frequency of the
card. An ETU will last 31
×
PDR clock pulses if CKU = 0 and half if CKU = 1. It should
be noted that when CKU = 1 it has no effect if f
CLK
= f
XTAL1
. This means, for example,
that a baud rate of 76800 is not possible when the card is clocked with the frequency on
XTAL1.
PSC
Prescaler: If bit PSC = 1, then the prescaler value is 32. If PSC = 0, then the prescaler
value is 31. One ETU will last a number of cards clock cycles equal to PSC
×
PDR. All
baud rates specified in “ISO7816”norm are achievable with this configuration.
26
DISTBE/
RBF
25
24
23
SAN
22
21
20
handbook, full pagewidth
MGU886
÷
31 or 32
PSC
÷
PDR
ETU
MUX
CLK
CKU
2
×
CLK
Fig.6 ETU generation.
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