參數(shù)資料
型號(hào)： 8XC51
廠商： Intel Corp.
英文描述： CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
中文描述： CHMOS單片8位微控制器
文件頁(yè)數(shù)： 33/58頁(yè)
文件大?。?/td> 233K
代理商： 8XC51
2003 Oct 30
33
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
8.10.2.3
Mixed Status Register (MSR)
This register relates the status of the card presence contact PR1, the BGT counter, the FIFO empty indication, the
transmit/receive ready indicator TBE/RBF and the completion of clock switching to or from
1
/
2
f
int
.
No bit within register MSR act upon INT0_N.
Table 48
Mixed status register, address Ch, read
Table 49
Description of register bits
BIT
7
6
5
4
3
2
1
0
0
Symbol
Reset value
CLKSW
FE
1
BGT
0
PR1
TBE/RBF
0
BIT
SYMBOL
DESCRIPTION
7
CLKSW
Clock Switch.
CLKSW is set when the TDA8029 has performed a required clock switch
from
1
/
n
f
XTAL
to
1
/
2
f
int
and is reset when the TDA8029 has performed a required clock
switch from
1
/
2
f
int
to
1
/
n
f
XTAL
. The application shall wait this bit before entering
power-down mode or restarting sending commands after leaving power-down (only
needed when the clock is not stopped during power-down). This bit is also reset by RIU
and at power-on. When the microcontroller wants to transmit a character to the card, it
writes the data in direct convention to this register.
FIFO Empty.
FE is set when the reception FIFO is empty. It is reset when at least one
character has been loaded in the FIFO.
Block Guard Time.
6
FE
5
BGT
In T = 1 protocol, the bit BGT is linked with a 22 ETU counter, which is started at every
start-bit on pin I/O. If the count is finished before the next start-bit, BGT is set. This helps
checking that the card has not answered before 22 ETU after the last transmitted
character, or that the reader is not transmitting a character before 22 ETU after the last
received character.
In T = 0 protocol, the bit BGT is linked to a 16 ETU counter, which is started at every
start-bit on I/O. If the count is finished before the next start-bit, then the bit BGT is set.
This helps checking that the reader is not transmitting too early after the last received
character.
Not used.
Presence 1.
PR1 = 1 when the card is present.
Not used.
4 and 3
2
1
PR1
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