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參數(shù)資料
| 型號： | MC68HC705V8 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 6/28頁 |
| 文件大小： | 220K |
| 代理商： | MC68HC705V8 |
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MOTOROLA
6
AN1224/D
Internal Power Supply
The MC68HC705V8 contains a fully integrated power supply which can be used to produce the regulated
+5-V supply for the device. This power supply includes a primary and secondary voltage regulator. The
primary voltage regulator uses a regulated DC supply input (up to 16 V) to produce a regulated +5-V
supply for all internal digital circuitry, except for the V
IGN
logic and power supply control logic. If the
REGDIS bit in the mask option register (MOR) is set, enabling the on-chip voltage regulation system, the
primary regulator will be enabled once a rising edge is detected on the V
IGN
pin, or on the BUS pin of the
MDLC module if the MDLCPU bit in the MOR is set.
Following a reset, if the internal power supply is enabled, the user should set bit 0 of the
miscellaneous (MISC) register. This will ensure that the primary regulator is not inadvertently
disabled by a subsequent read-modify-write command to the MISC register.
If at any time the user
does wish to disable the primary regulator, this can be done by clearing bit 0 of the MISC register. The
primary regulator will then remain disabled until a rising edge is detected on the V
IGN
pin. Once enabled,
in addition to supplying V
DD
to the internal circuitry, the primary regulator is also connected to the external
V
DD
pins, to allow external decoupling and to supply +5 V to the MDLC and A/D converter analog circuitry,
via V
CCA
, as well as providing a limited supply for external components. The secondary voltage regulator,
which cannot be disabled through software, is used by the MC68HC705V8 to supply a regulated +5-V
supply to the V
IGN
and power supply control logic.
NOTE
Even if the internal power supply is disabled, V
BATT
must still be supplied to the
MC68HC705V8 if the user wishes to use the MDLC module.
When laying out the power supply circuitry, the user should always follow good layout techniques to
minimize EMI, and to ensure a stable power supply to the MCU and other components. These techniques
include adequate decoupling of power supply pins, the use of a single point ground, and ground and power
planes where possible. Refer to
Figure 3 MC68HC705V8 Power Supply and Multiplex Bus Interface
Circuit
for an example MC68HC705V8 power supply connection circuit.
Pulse Width Modulation
The MC68HC705V8 contains a 6-bit pulse width modulation (PWM) system with two user programmable
prescalers. The PWM system can generate outputs ranging from 0% to 100% duty cycle. With the
programmable prescalers and 6-bit counter, the user can attain a wide range of PWM output frequencies
ranging from f
osc
/64 to f
osc
/8192.
Serial Peripheral Interface
The MC68HC705V8 contains a full-function serial peripheral interface (SPI) port, which can be used for
high speed serial communication with other peripherals or MCUs. The SPI is a full-duplex, three-wire
synchronous serial interface, with programmable clock phase and polarity, which can transmit and receive
data at up to 1.05 MHz in Master Mode, or at up to 2.1 MHz in Slave Mode, depending upon the oscillator
frequency.
MDLC OVERVIEW
The message data link controller (MDLC) module is a communications module which has been designed
to handle all of the necessary communication functions associated with transmitting and receiving frames
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