ST7PSCR1E4M1/XXX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7PSCR1E4M1/XXX

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

STMicroelectronics 

ST7SCR

SMARTCARD INTERFACE (Cont’d)

CHARACTER WAITING TIME REGISTER (CRD-

WTx)

CRDWT2

Read/Write

Reset Value: 0000 0000 (00h) .

7

0

WT WT WT WT WT WT WT WT

23

22

21

20

19

18

17

16

CRDWT1

Read/Write

Reset Value: 0010 0101 (25h)

7

0

WT WT WT WT WT WT WT9 WT8

15

14

13 12 11

10

CRDWT0

Read/Write

Reset Value: 1000 0000 (80h)

7

0

WT 7 WT6 WT5 WT4 WT3 WT2 WT1 WT0

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.

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