at91rm3400 ATMEL Corporation, at91rm3400 Datasheet - Page 23

• Manufacturer Part Number: at91rm3400
• Description: Atmel Advanced At91 Arm Microcontroller
• Manufacturer: ATMEL Corporation

Peripheral Implementation
USART
Timer Counter
USB Device Port
1790A–ATARM–11/03
The USART section describes features allowing management of the Modem Signals DTR,
DSR, DCD and RI.
In the AT91RM3400, only the USART1 implements these signals, named DTR1, DSR1, DCD1
and RI1.
The USART0, USART2 and USART3 do not implement all the modem signals. Only RTS and
CTS (RTS0 and CTS0, RTS2 and CTS2, RTS3 and CTS3, respectively) are implemented in
these USARTs for other features.
Thus, programming the USART0, USART2 or the USART3 in Modem Mode may lead to
unpredictable results. In these USARTs, the commands relating to the Modem Mode have no
effect and the status bits relating the status of the modem signals are never activated.
The Timer Counter 0 to 5 are described with five generic clock inputs, TIMER_CLOCK1 to
TIMER_CLOCK5. In the AT91RM3400, these clock inputs are connected to the Master Clock
(MCK), to the Slow Clock (SLCK) and to divisions of the Master Clock.
Table 6 gives the correspondence between the Timer Counter clock inputs and clocks in the
AT91RM3400. Each Timer Counter 0 to 5 displays the same configuration.
Table 6. Timer Counter Clocks Assignment
The USB device port is V2.0 full-speed compliant. It features six general purpose endpoints
configured as follows:
Endpoint 0: 8 bytes, no support of ping-pong mode
Endpoint 1: 64 bytes, supports ping-pong mode
Endpoint 2: 64 bytes, supports ping-pong mode
Endpoint 3 : 8 bytes, no support of ping-pong mode
Endpoint 4: 256 bytes, supports ping-pong mode
Endpoint 5 : 256 bytes, supports ping-pong mode
TIMER_CLOCK1
TIMER_CLOCK2
TIMER_CLOCK3
TIMER_CLOCK4
TIMER_CLOCK5
TC Clock Input
MCK/128
MCK/32
MCK/2
MCK/8
Clock
SLCK
AT91RM3400
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