XC68HC705B32CB Freescale Semiconductor, XC68HC705B32CB Datasheet - Page 80

• 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

6
If the receiver detects that a break (RDRF = 1, FE = 1, receiver data register = $0000) produced
the framing error, the start bit will not be artificially induced and the receiver must actually detect
a logic one before the start bit can be recognised (see
6.9
Transmit data is the serial data from the internal data bus that is applied through the SCI to the
output line. Data format is as discussed in
generates a bit time by using a derivative of the RT clock, thus producing a transmission rate equal
to 1/16th that of the receiver sample clock (assuming the same baud rate is selected for both the
receiver and transmitter).
Freescale
6-8
Expected stop
RDI
Break
Transmit data out (TDO)
RDI
RDI
Data
Data
Figure 6-6 Artificial start following a framing error
SERIAL COMMUNICATIONS INTERFACE
Figure 6-7 SCI start bit following a break
Data samples
Data samples
Data samples
Expected stop
Expected stop
b) Case 2: receive line high during expected start edge
a) Case 1: receive line low during artificial edge
Section 6.5
Start edge
Figure
Artificial edge
and shown in
qualifiers
Start
6-7).
verification
Start edge
samples
Detected as valid start edge
Start bit
Figure
Start bit
Start bit
6-3. The transmitter
Data
Data
MC68HC05B6
Rev. 4.1