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参数资料
| 型号： | ST72FSCR1R4M1 |
| 厂商： | 意法半导体 |
| 英文描述： | 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER |
| 中文描述： | 8位低功耗，全速USB微控制器与16K的闪存，768内存，智能卡的I /楼，计时器 |
| 文件页数： | 58/102页 |
| 文件大小： | 1413K |
| 代理商： | ST72FSCR1R4M1 |
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ST7SCR
58/102
SMARTCARD INTERFACE
(Cont’d)
Waiting Time Counter
The Waiting Time counter is a 24-bit counter used
to generate a timeout signal.
The elementary time unit counter acts as a pres-
caler to the Waiting Time counter which is incre-
mented at the etu rate.
The Waiting Time Counter can be used in both
UART mode and Manual mode and acts in differ-
ent ways depending on the selected mode.
The CRDWT2, CRDWT1 and CRDWT0 are load
registers only, the counter itself is not directly ac-
cessible.
UART Mode
The load conditions are either:
– A Start bit is detected while UART bit =1 and the
WTEN bit =1.
or
– A write access to the CRDWT2 register is per-
formed while the UART bit = 1 and the WTEN bit
= 0. In this case, the Waiting Time counter can be
used as a general purpose timer.
In UART mode, if the WTEN bit of the CRDCR reg-
ister is set,
the counter is loaded automatically on
start bit detection. Software can change the time
out value on-the-fly by writing to the
CRDWT registers. For example, in T=1 mode,
software must load the Block Waiting Time (BWT)
time-out in the CRDWT registers before the start
bit of the last transmitted character.
Then, after transmission of this last character, sig-
nalled by the TXC interrupt, software must write
the CWT value (Character Waiting Time) in the
CRDWT registers. See example in
Figure 31
.
Manual mode
The load conditions are:
– A write access to the CRDWT2 register is per-
formed while the UART bit = 0 and the WTEN bit
= 0
In Manual mode, if the WTEN bit of the CRDCR
register is reset, the timer acts as a general pur-
pose timer. The timer is loaded when a write ac-
cess to the CRDWT2 register occurs. The timer
starts when the WTEN bit = 1.
12.4.3.4 Interrupt generator
The Smartcard Interface has 2 interrupt vectors:
– Card Insertion/Removal Interrupt
– CRD Interrupt
The CRD interrupt is cleared when software reads
the CRDIPR register. The Card Insertion/Removal
is an external interrupt and is cleared automatical-
ly by hardware at the end of the interrupt service
routine (IRET instruction).
If an interrupt occurs while the CRDIPR register is
being read, the corresponding bit will be set by
hardware after the read access is done.
Figure 31. Waiting Time Counter Example
BWT
CWT
Reader
Smartcard
Firmware must program BWT
Firmware must program CWT
TXC Interrupt
Start bit
Waiting Time Counter
loaded on start bit
CHAR0
CHAR1
CHARn
CHAR0
CHAR1
1
相关PDF资料 |
PDF描述 |
|---|---|
| ST72PSCR1R4M1 | 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER |
| ST7SCR1R4T1 | Enclosures; External Depth:18.50"; External Height:47.312"; External Width:22"; Panel Width:19.00"; Enclosure Color:Royal Blue; Enclosure Material:Steel; Panel Space:42.00" RoHS Compliant: Yes |
| ST7PSCR1R4T1 | 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER |
| ST7FSCR1R4T1 | 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER |
| ST72SCR1R4T1 | 8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER |
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| ST72T101G1B6 | 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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