MC68HC711P2CFN4 Freescale Semiconductor, MC68HC711P2CFN4 Datasheet - Page 117

• Manufacturer Part Number: MC68HC711P2CFN4
• Description: IC MCU 32K OTP 4MHZ 84-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711P2CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: MI Bus, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 640 x 8
• Ram Size: 1K 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: 84-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

6.9 MI BUS clock rate
6.10 SCI/MI BUS2 registers
MC68HC11P2 — Rev 1.0
NOTE:
The MI BUS line can take two states, recessive or dominant. The
recessive state (‘1’) is represented by 5V, through a pull-up resistor of
10k¾. The dominant state (‘0’) is represented by a maximum 0.3V
(V
The bus load depends on the number of devices on the bus. Each device
has a pull-up resistor of 10k¾. An external termination resistor is used
to stabilize the load resistance of the bus at 600¾.
The MI BUS clock rate is set via the SCI baud registers. To use the
MI BUS the ST4XCK clock frequency that drives the SCI clock generator
must be selected to match the minimum resolution of the MI BUS logic.
This is expressed by the following formula:
where ‘n’ is an integer and 20kHz is the minimum Push field bit rate for
the MI BUS. Values for ST4XCK could be 1280kHz, 2560kHz, …, n •
1280kHz. The value ‘n’ is the modulus for the MI BUS baud register (see
S2BDH, S2BDL — MI BUS clock rate control
ST4XCK may be the output of the PLL circuit or it may be the EXTAL
input of the MCU. This selection is made by setting the MCS bit which is
described in
MI BUS operation is controlled by the same group of registers as is used
for the SCI. However the function of some of the bits is modified when in
MI BUS mode. A description of the registers, as applicable to the
MI BUS function, is given here.
Bits that have no meaning in MI BUS mode are shown shaded to avoid
confusion.
CESAT
Freescale Semiconductor, Inc.
For More Information On This Product,
ST4XCK = 16 • 2n • (2 • Push_field_bit_rate) = 16 • 2n • 40kHz =
n • 1280kHz
Motorola Interconnect Bus (MI BUS)
of the transistor, T1).
Go to: www.freescale.com
PLLCR — PLL control
register.
Motorola Interconnect Bus (MI BUS)
registers). The
MI BUS clock rate
Technical Data