參數(shù)資料
型號： MC68HC705E6
廠商： 飛思卡爾半導體(中國)有限公司
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 21/140頁
文件大?。?/td> 788K
代理商： MC68HC705E6
Modes of Operation and Pin Descriptions
Pin descriptions
MC68HC05E6 — Rev. 1.0
Modes of Operation and Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
9-pin
PC0DPC7
These eight port pins comprise port C. The state of any pin is software
programmable, and all the pins can be configured as inputs with pull-up
resistors or open-drain outputs using the data direction register and
configuration register. During power-on or reset, all port C registers are
cleared, thereby returning the port pins to normal inputs with pull-up
resistors. In addition to their normal I/O functions, PC0 is shared with the
input capture function (TCAP) of the programmable timer and PC1 with
the output compare function (TCMP); see
Port C
. PC0–PC7 are used to
provide a keyboard interrupt facility when configured as inputs and not
used for timer functions. They contain an internal Schmitt trigger as part
of their input to improve noise immunity.
NOTE:
PC6 and PC7 are not available in the 28-pin package.
PD0DPD7
These eight port pins comprise port D. The state of any pin is software
programmable, and all the pins can be configured as inputs with pull-up
resistors or open-drain outputs using the configuration register. During
power-on or reset, all port D registers are cleared, thereby returning the
port pins to normal inputs with pull-up resistors.
NOTE:
PD0–PD7 are not bonded out in the 28-pin package.
PG0DPG3
These four input-only port pins comprise port G. In addition to their
normal input functions, the pins are shared with the A/D converter
subsystem where they are used as the digital input pins AD0–AD3 (see
A-to-D Converter
).
NOTE:
PG1–PG3 are not bonded out in the 28-pin package; the A/D converter
has only one input channel.
VREFH
This pin provides the high voltage reference for the A/D converter. The
low voltage reference (VREFL) is tied to VSS internally.
F
Freescale Semiconductor, Inc.
n
.
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