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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 40/58頁 |
| 文件大小： | 233K |
| 代理商： | 8XC51 |
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2003 Oct 30
40
Philips Semiconductors
Product specification
Low power single card reader
TDA8029
Table 64
Description of register bits
Table 65
Clock value for an asynchronous card
BIT
SYMBOL
DESCRIPTION
7 and 6
5
SHL
Not used.
Select HIGH Level.
This bit determines how the clock is stopped when bit CST = 1. If
SHL = 0, then the clock is stopped at LOW level, if SHL = 1 at HIGH level.
Clock Stop.
In case of an asynchronous card, bit CST defines whether the clock to the
card is stopped or not. If CST = 1, then the clock is stopped. If CST = 0, then the clock is
determined by bits AC[2:0] according to Table 65. All frequency changes are
synchronous, ensuring that no spike or unwanted pulse width occurs during changes
Synchronous Clock.
In the event of a synchronous card, then pin CLK is the copy of the
value of bit SC. In reception mode, the data from the card is available to bit UR0 after a
read operation of register URR. In transmission mode, the data is written on the I/O line
of the card when register UTR has been written to.
Asynchronous card clock.
When CST = 0, the clock is determined by the state of these
bits according to Table 65.
4
CST
3
SC
2 to 0
AC[2:0]
f
int
is the frequency delivered by the internal oscillator clock circuitry.
For switching from
1
/
n
f
XTAL
to
1
/
2
f
int
and reverse, only the bit AC2 must be changed (AC1
and AC0 must remain the same). For switching from
1
/
n
f
XTAL
or
1
/
2
f
int
to stopped clock
and reverse, only bits CST and SHL must be changed.
When switching from
1
/
n
f
XTAL
to
1
/
2
f
int
and reverse, a delay can occur between the
command and the effective frequency change on pin CLK. The fastest switch is from
1
/
2
f
XTAL
to
1
/
2
f
int
and reverse, the best regarding duty cycle is from
1
/
8
f
XTAL
to
1
/
2
f
int
and
reverse. The bit CLKSW in register MSR tells the effective switch moment.
In case of f
CLK
= f
XTAL
, the duty cycle must be ensured by the incoming clock signal on
pin XTAL1.
AC2
AC1
AC0
CLOCK
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
f
XTAL
1
/
2
f
XTAL
1
/
4
f
XTAL
1
/
8
f
XTAL
1
/
2
f
int
1
0
1
1
/
2
f
int
1
1
0
1
/
2
f
int
1
1
1
1
/
2
f
int
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相關代理商/技術參數(shù) |
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|---|---|
| 8XC51FA | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit CMOS (low voltage, low power and high speed) microcontroller families |
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| 8XC51FX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS |
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