XC68HC705B32CB Freescale Semiconductor, XC68HC705B32CB Datasheet - Page 79

• Manufacturer Part Number: XC68HC705B32CB
• Description: IC MCU 2.1MHZ 32K OTP 56-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of XC68HC705B32CB

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 256 x 8
• Ram Size: 528 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 56-SDIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

If there has been a framing error without detection of a break (10 zeros for 8 bit format or 11 zeros
for 9 bit format), the circuit continues to operate as if there actually was a stop bit, and the start
edge will be placed artificially. The last bit received in the data shift register is inverted to a logic
one, and the three logic one start qualifiers (shown in
register during the interval when detection of a start bit is anticipated (see
the start bit will be accepted no sooner than it is anticipated.
MC68HC05B6
Rev. 4.1
RDI
RDI
RDI
16X internal sampling clock
RT clock edges for all three examples
Idle
1
1
1
Previous bit
RDI
1
1
1
Figure 6-4 SCI examples of start bit sampling technique
1
1
1
Figure 6-5 SCI sampling technique used on all bits
16RT 1RT
1
1
1
SERIAL COMMUNICATIONS INTERFACE
1
1
1
Noise
Present bit
1
1
0
1
1
1
1
1
1
1
1
1
qualifiers
8RT 9RT 10RT
Start
1
1
1
Samples
1
1
1
Start
Start
Start
1RT 2RT 3RT
0
0
0
Figure
0
0
0
verification samples
6-4) are forced into the sample shift
4RT
Start edge
Noise
5RT
16RT 1RT
0
1
0
6RT
Next bit
7RT
0
0
0
Figure
8RT
6-6); therefore,
Freescale
6-7
6