MC68331MEH16 Freescale Semiconductor, MC68331MEH16 Datasheet - Page 66

• Manufacturer Part Number: MC68331MEH16
• Description: IC MCU 32BIT 16MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68331MEH16

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, SCI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 132-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Ram Size: -
• Program Memory Size: -
• Data Converters: -

SCCR1 — SCI Control Register 1
Bit 15 — Not Implemented
LOOPS — Loop Mode
WOMS — Wired-OR Mode for SCI Pins
ILT — Idle-Line Detect Type
66
RESET:
Nominal Baud Rate
15
0
0
*A rate of 64 baud is not available with a 20.97-MHz system clock. To achieve this rate, the SYNCR can be pro-
SCCR1 contains SCI configuration parameters. The CPU can read and write this register at any time.
The SCI can modify RWU in some circumstances. In general, interrupts enabled by these control bits
are cleared by reading SCSR, then reading (receiver status bits) or writing (transmitter status bits)
SCDR.
LOOPS controls a feedback path on the data serial shifter. When loop mode is enabled, SCI transmitter
output is fed back into the receive serial shifter. TXD is asserted (idle line). Both transmitter and receiver
must be enabled before entering loop mode.
WOMS determines whether the TXD pin is an open-drain output or a normal CMOS output. This bit is
used only when TXD is an output. If TXD is used as a general-purpose input pin, WOMS has no effect.
Maximum Rate
grammed to generate a lower system clock rate.
0 = Normal SCI operation, no looping, feedback path disabled
1 = Test SCI operation, looping, feedback path enabled
0 = If configured as an output, TXD is a normal CMOS output.
1 = If configured as an output, TXD is an open-drain output.
0 = Short idle-line detect (start count on first one)
1 = Long idle-line detect (start count on first one after stop bit(s))
19200
38400
76800
1200
2400
4800
9600
110
300
600
64*
14
0
0
13
0
0
12
0
Freescale Semiconductor, Inc.
16.78-MHz Clock
Actual Rate with
11
For More Information On This Product,
0
524288.0
19418.1
37449.1
74898.3
1199.7
2405.0
4810.0
9532.5
110.0
299.9
599.9
64.0
10
0
Go to: www.freescale.com
Table 25 SCI Baud Rates
9
0
8
0
SCBR Value
$1FFF
$06D4
$00DA
$006D
$129E
$036A
$000E
$0165
$0037
$0016
$0007
$0001
7
0
SCBR
6
0
5
0
20.97-MHz Clock
Actual Rate with
655360.0
19275.3
38550.6
72817.8
1200.3
2400.6
4783.6
9637.6
4
0
110.0
300.1
600.1
—
3
0
2
0
MC68331TS/D
SCBR Value
$1745
$0888
$0444
$0222
$0111
$0089
$0044
$0022
$0011
$0009
$0001
$YFFC0A
1
0
—
0
0