Datasheet

Chapter 14. UART Modules 14-9
Register Descriptions
Table 14-5 describes UCSRn fields.
14.3.5 UART Command Registers (UCRn)
The UART command registers (UCRn), Figure 14-6, supply commands to the UART. Only
multiple commands that do not conflict can be specified in a single write to a UCRn. For
example,
RESET TRANSMITTER and ENABLE TRANSMITTER cannot be specified in one
command.
Table 14-6 describes UCRn fields and commands. Examples in Section 14.5.2,
“Transmitter and Receiver Operating Modes,” show how these commands are used.
Table 14-5. UCSRn Field Descriptions
Bits Name Description
7–4 RCS Receiver clock select. Selects the clock source for the receiver channel.
1101 Prescaled BCLKO
1110 TIN divided by 16
1111 TIN
3–0 TCS Transmitter clock select. Selects the clock source for the transmitter channel.
1101 Prescaled BCLKO
1110 TIN divided by 16
1111 TIN
76 43210
Field — MISC TC RC
Reset 0000_0000
R/W Write only
Address MBAR + 0x1C8, 0x208
Figure 14-6. UART Command Register (UCRn)
Table 14-6. UCRn Field Descriptions
Bits Value Command Description
7 ——Reserved, should be cleared.
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