PXD10RM Datasheet, PDF (871/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

23.8 Functional description
23.8.1 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.
Byte Field
Start
bit ^{D0 D1 D2 D3 D4 D5 D6 D7}
Stop
bit
— Data bit
— Parity bit
Figure 23-28. 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 7 data bits is 1. An odd parity is cleared in this
case.
Byte Field
Start
bit
D0
D1
D2
D3
D4
D5
D6
D7
D8
Stop
bit
— Parity bit
Figure 23-29. UART mode 9-bit data frame
23.8.1.1 Buffer in UART mode
The 8-byte buffer is divided into two parts: one for receiver and one for transmitter as shown in
Table 23-31.
Freescale Semiconductor
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
23-39