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ST7SCR bảng dữ liệu(PDF) 68 Page - STMicroelectronics

tên linh kiện ST7SCR
Giải thích chi tiết về linh kiện  8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7SCR bảng dữ liệu(HTML) 68 Page - STMicroelectronics

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ST7SCR
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SMARTCARD INTERFACE (Cont’d)
CHARACTER WAITING TIME REGISTER (CRD-
WTx)
CRDWT2
Read/Write
Reset Value: 0000 0000 (00h) .
CRDWT1
Read/Write
Reset Value: 0010 0101 (25h)
CRDWT0
Read/Write
Reset Value: 1000 0000 (80h)
WT: Character waiting time value expressed in
ETU (0 / 16777215).
The CRDWT0, CRDWT1 and CRDWT2 registers
hold the load value of the Waiting Time counter.
Note: A read operation does not return the counter
value.
This counter can be used as a general purpose
timer.
If the WTEN bit of the CRDCR register is reset, the
counter is reloaded when a write access in the
CRDWT2 register occurs. It starts when the
WTEN bit is set.
If the WTEN bit in the CRDCR register is set and if
UART mode is activated, the counter acts as an
autoreload timer. The timer is reloaded when a
start bit is sent or detected. An interrupt is generat-
ed if the timer overflows between two consecutive
start bits.
Note: When loaded with a 0 value, the Waiting
Time counter stays at 0 and the WTF bit = 1.
70
WT
23
WT
22
WT
21
WT
20
WT
19
WT
18
WT
17
WT
16
70
WT
15
WT
14
WT
13
WT
12
WT
11
WT
10
WT9
WT8
70
WT 7
WT6
WT5
WT4
WT3
WT2
WT1
WT0



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