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

USB INTERFACE (Cont’d)

RECEPTION COUNTER REGISTER (CNT0RXR)

Read/Write

Reset Value: 0000 0000 (00h)

7

0

0

0

0

0 CNT3 CNT2 CNT1 CNT0

This register contains the allocated buffer size for

endpoint 0 reception, setting the maximum

number of bytes the related endpoint can receive

with the next OUT or SETUP transaction. At the

end of a reception, the value of this register is the

max size decremented by the number of bytes re-

ceived (to determine the number of bytes re-

ceived, the software must subtract the content of

this register from the allocated buffer size).

RECEPTION COUNTER REGISTER (CNT2RXR)

Read/Write

Reset Value: 0000 0000 (00h)

7

0

0 CNT6 CNT5 CNT4 CNT3 CNT2 CNT CNT0

This register contains the allocated buffer size for

endpoint 2 reception, setting the maximum

number of bytes the related endpoint can receive

with the next OUT transaction. At the end of a re-

ception, the value of this register is the max size

decremented by the number of bytes received (to

determine the number of bytes received, the soft-

ware must subtract the content of this register from

the allocated buffer size).

TRANSMISSION COUNTER REGISTER

(CNT0TXR, CNT1TXR, CNT3TXR, CNT4TXR,

CNT5TXR)

Read/Write

Reset Value 0000 0000 (00h)

7

0

0

0

0

0 CNT3 CNT2 CNT1 CNT0

This register contains the number of bytes to be

transmitted by Endpoint 0, 1, 3, 4 or 5 at the next

IN token addressed to it.

TRANSMISSION COUNTER REGISTER

(CNT2TXR)

Read/Write

Reset Value 0000 0000 (00h)

7

0

0 CNT6 CNT5 CNT4 CNT3 CNT2 CNT1 CNT0

This register contains the number of bytes to be

transmitted by Endpoint 2 at the next IN token ad-

dressed to it.

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