Datasheet

UART Modules
MOTOROLA MCF5206e USER’S MANUAL 12-27
Do Not Use
Do not use this bit combination because the result is indeterminate.
RC1–RC0 — Receiver Commands
These bits select a single command as listed in Table 12-10.
No Action Taken
The ‘‘no action taken’’ command causes the receiver to stay in its current mode. If the
receiver is enabled, it remains enabled; if disabled, it remains disabled.
Receiver Enable
The ‘‘receiver enable’’ command enables operation of the channel's receiver. If the UART
module is not in multidrop mode, this command also forces the receiver into the search-
for-start-bit state. If the receiver is already enabled, this command has no effect.
Receiver Disable
The ‘‘receiver disable’’ command immediately disables the receiver. Any character being
received is lost. The command has no effect on the receiver status bits or any other control
register. If the UART module is programmed to operate in the local loopback mode or
multidrop mode, the receiver operates even though this command is selected. If the
receiver is already disabled, this command has no effect.
Do Not Use
Do not use this bit combination because the result is indeterminate.
12.4.1.6 RECEIVER BUFFER (URB). The receiver buffer contains three receiver-
holding registers and a serial shift register. The RxD pin is connected to the serial shift
register while the holding registers act as a FIFO. The CPU reads from the top of the stack
Table 12-10. RCx Control Bits
RC1 RC0 COMMAND
0 0 No Action Taken
0 1 Receiver Enable
1 0 Receiver Disable
1 1 Do Not Use
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