MC68340AG16E Freescale Semiconductor, MC68340AG16E Datasheet - Page 325

• Manufacturer Part Number: MC68340AG16E
• Description: IC MPU 32BIT 16MHZ 144-LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68340AG16E

• Processor Type: M683xx 32-Bit
• Speed: 16MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Controller Family/series: 68K
• Core Size: 32 Bit
• No. Of I/o's: 16
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Embedded Interface Type: UART
• Digital Ic Case Style: LQFP
• Rohs Compliant: Yes
• Processor Series: M683xx
• Core: CPU32
• Maximum Clock Frequency: 16 MHz
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Details

RC1–RC0—Receiver Commands
7.4.1.8 RECEIVER BUFFER (RB). The receiver buffer contains three receiver holding
registers and a serial shift register. The channel's RxDx pin is connected to the serial shift
register. The holding registers act as a FIFO. The CPU32 reads from the top of the stack
while the receiver shifts and updates from the bottom of the stack when the shift register
has been filled (see Figure 7-4). This register can only be read when the serial module is
enabled (i.e., the STP bit in the MCR is cleared).
RB7–RB0—These bits contain the character in the receiver buffer.
7.4.1.9 TRANSMITTER BUFFER (TB). The transmitter buffer consists of two registers,
the transmitter holding register and the transmitter shift register (see Figure 7-4). The
holding register accepts characters from the bus master if the TxRDY bit in the channel's
SR is set. A write to the transmitter buffer clears the TxRDY bit, inhibiting any more
7-30
These bits select a single command as listed in Table 7-8.
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 serial 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 disables the receiver immediately.
Any character being received is lost. The command has no effect on the receiver status
bits or any other control register. If the serial 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.
RBA, RBB
Read Only
RESET:
RB7
Freescale Semiconductor, Inc.
7
0
For More Information On This Product,
RC1
0
0
1
1
RB6
Table 7-8. RCx Control Bits
6
0
MC68340 USER’S MANUAL
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RB5
RC0
5
0
0
1
0
1
RB4
4
0
No Action Taken
Disable Receiver
Enable Receiver
RB3
Do Not Use
3
0
Command
Supervisor/User
RB2
2
0
$713, $71B
RB1
1
0
RB0
0
0
MOTOROLA