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AT90SCR100 데이터시트(PDF) 215 Page - ATMEL Corporation

부품명 AT90SCR100
상세설명  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 데이터시트(HTML) 215 Page - ATMEL Corporation

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TPR0327AY–SMS–30Jan09
AT90SCR100
17.5.13
IN Pipe management
17.5.13.1
“Manual” mode
When the Host requires data from the device, the firmware has to determine first the IN mode to
use using the INMODE bit:
• UPCRX.INMODE = 0. The UPINRQX register is taken in account. The Host controller will
perform (UPINRQX+1) IN requests on the selected Pipe before freezing the Pipe. This mode
avoids to have extra IN requests on a Pipe.
• UPCRX.INMODE = 1. The USB controller will perform infinite IN request until the firmware
freezes the Pipe.
The IN request generation will start when the firmware clear the UPCRX.PFREEZE bit.
Each time the current bank is full, the UPINTX.RXINI and the UPINTX.FIFOCON bits are set.
This triggers an interrupt if the UPIENX.RXINE bit is set. The firmware can acknowledge the
USB interrupt by clearing the UPINTX.RXINI bit. The Firmware reads the data and clears the
UPINTX.FIFOCON bit in order to free the current bank. If the IN Pipeis composed of multiple
banks, clearing the UPINTX.FIFOCON bit will switch to the next bank. The RXINI and FIFOCON
bits are then updated by hardware in accordance with the status of the new bank.
Figure 17-8.
Example of IN Data bank Management
The Pipe must be configured first.
Note
IN
ACK
DATA
(to Bank 0)
UPINTX.RXINI
SW
SW
UPINTX.FIFOCON
SW
Read data from CPU
Bank 0
Read data from CPU
Bank 0
HW
IN
ACK
DATA
(to Bank 0)
HW
Example with 1 IN data bank
IN
ACK
DATA
(to Bank 0)
UPINTX.RXINI
SW
SW
UPINTX.FIFOCON
SW
Read data from CPU
Bank 0
Read data from CPU
Bank 1
HW
IN
ACK
DATA
(to Bank 1)
HW
Example with 2 IN data banks



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