MC68HC11E1CFU3 Freescale Semiconductor, MC68HC11E1CFU3 Datasheet - Page 113

• Manufacturer Part Number: MC68HC11E1CFU3
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC11E1CFU3

• Cpu Family: HC11
• Device Core Size: 8b
• Frequency (max): 3MHz
• Interface Type: SCI/SPI
• Program Memory Type: ROMLess
• Program Memory Size: Not Required
• Total Internal Ram Size: 512Byte
• # I/os (max): 38
• Number Of Timers - General Purpose: 8
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

FE — Framing Error Flag
Bit 0 — Unimplemented
7.7.5 Baud Rate Register
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
TCLR — Clear Baud Rate Counter Bit (Test)
SCP[2:0] — SCI Baud Rate Prescaler Select Bits
RCKB — SCI Baud Rate Clock Check Bit (Test)
Freescale Semiconductor
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
See
0 = Stop bit detected
1 = Zero detected
Table
Table 7-1
7-1.
Address:
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
Reset:
Read:
Write:
for normal baud rate selections.
U = Unaffected
$102B
TCLR
Bit 7
0
Figure 7-7. Baud Rate Register (BAUD)
SCP2
6
0
M68HC11E Family Data Sheet, Rev. 5.1
SCP1
5
0
NOTE
SCP0
4
0
Figure 7-8
RCKB
3
0
SCR2
and
U
2
Figure
SCR1
U
1
7-9.
SCR0
Bit 0
U
SCI Registers
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