ST7SCR_07 datasheet(68/101 Pages) STMICROELECTRONICS

Teilenummer	ST7SCR

Bauteilbeschribung	8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER

PDF	101 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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68 / 101 page

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.

WT9

WT8

WT 7

WT6

WT5

WT4

WT3

WT2

WT1

WT0

ST7SCR Datenblatt(PDF) 68 Page - STMicroelectronics

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