at91rm3400 ATMEL Corporation, at91rm3400 Datasheet - Page 317
at91rm3400
Manufacturer Part Number
at91rm3400
Description
Atmel Advanced At91 Arm Microcontroller
Manufacturer
ATMEL Corporation
Datasheet
1.AT91RM3400.pdf
(461 pages)
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Transmitter
Operations
Figure 127. Transmitter Block Diagram
1790A–ATARM–11/03
Transmitter Clock
SSC_TFMR.DATLEN
SSC_TCMR.STTDLY
SSC_TFMR.FSDEN
RF
Selector
Start
TF
A transmitted frame is triggered by a start event and can be followed by synchronization data
before data transmission.
The start event is configured by setting the Transmit Clock Mode Register (SSC_TCMR). See
“Start” on page 318.
The frame synchronization is configured setting the Transmit Frame Mode Register
(SSC_TFMR). See “Frame Sync” on page 320.
To transmit data, the transmitter uses a shift register clocked by the transmitter clock signal
and the start mode selected in the SSC_TCMR. Data is written by the application to the
SSC_THR register then transferred to the shift register according to the data format selected.
When both the SSC_THR and the transmit shift register are empty, the status flag TXEMPTY
is set in SSC_SR. When the Transmit Holding register is transferred in the Transmit shift reg-
ister, the status flag TXRDY is set in SSC_SR and additional data can be loaded in the holding
register.
SSC_TFMR.MSBF
SSC_THR
SSC_TFMR.DATDEF
Transmit Shift Register
0
1
SSC_TSHR
1
0
SSC_TCMR.STTDLY
SSC_TFMR.FSDEN
SSC_TFMR.DATNB
SSC_TFMR.FSLEN
SSC_CR.TXEN
SSC_CR.TXDIS
SSC_SR.TXEN
AT91RM3400
TD
317
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