MC68331CEH25 Freescale Semiconductor, MC68331CEH25 Datasheet - Page 148

IC MCU 32BIT 25MHZ 132-PQFP

MC68331CEH25

Manufacturer Part Number
MC68331CEH25
Description
IC MCU 32BIT 25MHZ 132-PQFP
Manufacturer
Freescale Semiconductor
Series
M683xxr
Datasheets

Specifications of MC68331CEH25

Core Processor
CPU32
Core Size
32-Bit
Speed
25MHz
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 ~ 85°C
Package / Case
132-QFP
Controller Family/series
68K
No. Of I/o's
18
Cpu Speed
25MHz
No. Of Timers
1
Embedded Interface Type
QSPI, SCI, UART
No. Of Pwm Channels
2
Digital Ic Case Style
PQFP
Rohs Compliant
Yes
Processor Series
M683xx
Core
CPU32
Data Bus Width
32 bit
Data Ram Size
80 B
Interface Type
QSPI, SCI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
18
Number Of Timers
1
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Eeprom Size
-
Ram Size
-
Program Memory Size
-
Data Converters
-
Lead Free Status / Rohs Status
 Details

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6
6.4 Serial Communication Interface
6.4.1 SCI Registers
6.4.1.1 Control Registers
6-22
The serial communication interface (SCI) communicates with external devices through
an asynchronous serial bus. The SCI uses a standard nonreturn to zero (NRZ) trans-
mission format. The SCI is fully compatible with other Freescale SCI systems, such as
those in M68HC11 and M68HC05 devices. Figure 6-7 is a block diagram of the SCI
transmitter; Figure 6-8 is a block diagram of the SCI receiver.
The SCI programming model includes the QSM global and pin control registers, and
four SCI registers. There are two SCI control registers (SCCR0 and SCCR1), one sta-
tus register (SCSR), and one data register (SCDR). Refer to APPENDIX D REGIS-
TER SUMMARY for register bit and field definition.
SCCR0 contains the baud rate selection field. Baud rate must be set before the SCI is
enabled. The CPU can read and write this register at any time.
SCCR1 contains a number of SCI configuration parameters, including transmitter and
receiver enable bits, interrupt enable bits, and operating mode enable bits. The CPU
can read and write this register at any time. The SCI can modify the RWU bit under
certain circumstances.
Changing the value of SCI control bits during a transfer operation may disrupt opera-
tion. Before changing register values, allow the SCI to complete the current transfer,
then disable the receiver and transmitter.
Freescale Semiconductor, Inc.
For More Information On This Product,
QUEUED SERIAL MODULE
Go to: www.freescale.com
USER’S MANUAL
MC68331

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