MC68HC912B32CFU8 Freescale Semiconductor, MC68HC912B32CFU8 Datasheet - Page 222

• Manufacturer Part Number: MC68HC912B32CFU8
• Description: IC MCU 32K FLASH 8MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MC68HC912B32CFU8

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 63
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 768 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Byte Data Link Communications (BDLC)
15.7.3.1 Logic 0
A logic 0 is defined as:
See
15.7.3.2 Logic 1
A logic 1 is defined as:
See
15.7.3.3 Normalization Bit (NB)
The NB symbol has the same property as a logic 1 or a logic 0. It is used only in IFR message responses.
15.7.3.4 Break Signal (BREAK)
The BREAK signal is defined as a passive-to-active transition followed by an active period of at least 240
µs (see
222
ACTIVE
PASSIVE
ACTIVE
PASSIVE
•
•
•
•
Figure
Figure
An active-to-passive transition followed by a passive period 64 µs in length, or
A passive-to-active transition followed by an active period 128 µs in length
An active-to-passive transition followed by a passive period 128 µs in length, or
A passive-to-active transition followed by an active period 64 µs in length
Figure
15-5(A).
15-5(B).
15-5(C)).
ACTIVE
PASSIVE
ACTIVE
PASSIVE
Figure 15-5. J1850 VPW Symbols with Nominal Symbol Times
(F) END OF FRAME
(C) BREAK
≥ 240 µs
280 µs
M68HC12B Family Data Sheet, Rev. 9.1
(G) INTER-FRAME
SEPARATION
128 µs
128 µs
20 µs
300 µs
(A) LOGIC 0
(B) LOGIC 1
(D) START OF FRAME
200 µs
OR
OR
IDLE > 300 µs
(H) IDLE
64 µs
64 µs
Freescale Semiconductor
(E) END OF DATA
200 µs