MC68HC11E1CFN3 Freescale Semiconductor, MC68HC11E1CFN3 Datasheet - Page 128

• Manufacturer Part Number: MC68HC11E1CFN3
• Description: IC MCU 3MHZ 512 EEPROM 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC11E1CFN3

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 3MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Type: ROMless
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 3 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 16 bit
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details

Serial Communications Interface (SCI)
Data Sheet
128
SCR[2:0] — SCI Baud Rate Select Bits
Selects receiver and transmitter bit rate based on output from baud rate
prescaler stage. Refer to
The prescaler bits, SCP[2:0], determine the highest baud rate, and the SCR[2:0]
bits select an additional binary submultiple (÷1, ÷2, ÷4, through ÷128) of this
highest baud rate. The result of these two dividers in series is the 16X receiver
baud rate clock. The SCR[2:0] bits are not affected by reset and can be changed
at any time, although they should not be changed when any SCI transfer is in
progress.
Figure 7-8
prescaler select bits determine the highest baud rate. The rate select bits
determine additional divide by two stages to arrive at the receiver timing (RT)
clock rate. The baud rate clock is the result of dividing the RT clock by 16.
Freescale Semiconductor, Inc.
XTAL
EXTAL
For More Information On This Product,
Figure 7-8. SCI Baud Rate Generator Block Diagram
Serial Communications Interface (SCI)
and
CLOCK GENERATOR
Go to: www.freescale.com
Figure 7-9
OSCILLATOR
AND
(÷4)
Figure 7-8
illustrate the SCI baud rate timing chain. The
AS
E
÷
÷
÷
÷
÷
÷
÷
2
2
2
2
2
2
2
and
0:0
Figure
SCR[2:0]
0:0:0
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
÷
3
INTERNAL BUS CLOCK (PH2)
0:1
7-9.
÷
M68HC11E Family — Rev. 5
4
1:0
BAUD RATE
BAUD RATE
TRANSMIT
RECEIVE
÷
(16X)
÷
(1X)
SCI
SCI
13
16
1:1
SCP[1:0]
MOTOROLA