MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 157

• Manufacturer Part Number: MC68HC711E20CFN2
• Description: IC MCU 20K 2MHZ OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711E20CFN2

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 2MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 38
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: OTP
• Eeprom Size: 512 x 8
• Ram Size: 768 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

7.8.5 Baud Rate Register
M68HC11E Family — Rev. 3.2
MOTOROLA
NOTE:
Address:
FE — Framing Error Flag
Bit 0 — Unimplemented
Use this register to select different baud rates for the SCI system. The
SCP[1:0] (SCP[2:0] in MC68HC(7)11E20) bits function as a prescaler for
the SCR[2:0] bits. Together, these five bits provide multiple baud rate
combinations for a given crystal frequency. Normally, this register is
written once during initialization. The prescaler is set to its fastest rate by
default out of reset and can be changed at any time. Refer to
for normal baud rate selections.
TCLR — Clear Baud Rate Counter Bit (Test)
SCP[2:0] — SCI Baud Rate Prescaler Select Bits
SCP2 applies to MC68HC(7)11E20 only. When SCP2 = 1, SCP[1:0]
must equal 0s. Any other values for SCP[1:0] are not decoded in the
prescaler and the results are unpredictable. Refer to
Figure
Reset:
Read:
Write:
FE is set when a 0 is detected where a stop bit was expected. Clear
the FE flag by reading SCSR with FE set and then reading SCDR.
Always reads 0
0 = Stop bit detected
1 = Zero detected
U = Unaffected
7-9.
Serial Communications Interface (SCI)
$102B
TCLR
Bit 7
0
Figure 7-7. Baud Rate Register (BAUD)
SCP2
6
0
SCP1
5
0
SCP0
4
0
Serial Communications Interface (SCI)
RCKB
3
0
SCR2
U
2
Figure 7-8
SCR1
U
1
Technical Data
SCI Registers
Table 7-1
and
SCR0
Bit 0
U
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