MPC5604B/C Microcontroller Reference Manual, Rev. 8
Freescale Semiconductor 409
21.8 Functional description
21.8.1 UART mode
The main features in the UART mode are
• Full duplex communication
• 8- or 9-bit data with parity
• 4-byte buffer for reception, 4-byte buffer for transmission
• 8-bit counter for timeout management
8-bit data frames: The 8th bit can be a data or a parity bit. Even/Odd Parity can be selected by the Odd
Parity bit in the UARTCR. An even parity is set if the modulo-2 sum of the 7 data bits is 1. An odd parity
is cleared in this case.
Figure 21-27. UART mode 8-bit data frame
9-bit frames: The 9th bit is a parity bit. Even/Odd Parity can be selected by the Odd Parity bit in the
UARTCR. An even parity is set if the modulo-2 sum of the 8 data bits is 1. An odd parity is cleared in this
case.
Figure 21-28. UART mode 9-bit data frame
21.8.1.1 Buffer in UART mode
The 8-byte buffer is divided into two parts: one for receiver and one for transmitter as shown in
Table 21-30.
Start
bit
D0
D7
Stop
bit
Byte Field
— Data bit
— Parity bit
D1 D2 D3 D4 D5 D6
Start
bit
D0
D7
Stop
bit
Byte Field
— Parity bit
D1 D2 D3 D4 D5 D6
D8
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