參數資料
型號: MC68HC05P4ADWR3
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數: 16/102頁
文件大?。?/td> 930K
代理商: MC68HC05P4ADWR3
Advance Information
MC68HC05P4A — Rev. 6.0
20
General Description
MOTOROLA
General Description
trigger as part of its input to improve noise immunity. Refer to Section 3.
1.7.3 OSC1 and OSC2
These pins provide control input for an on-chip clock oscillator circuit. A
crystal, a ceramic resonator, a resistor/capacitor combination, or an
external signal connects to these pins and provides a system clock. A
mask option selects either a crystal/ceramic resonator or a
resistor/capacitor as the frequency determining element. The oscillator
frequency is two times the internal bus rate.
1.7.4 RESET
This active low pin is used to reset the MCU to a known startup state by
pulling RESET low. The RESET pin contains an internal Schmitt trigger
as part of its input to improve noise immunity.
1.7.5 TCMP
This pin provides an output for the output compare feature of the on-chip
timer system.
1.7.6 PA0–PA7
Port A is an 8-bit bidirectional port which does not share any of its pins
with other subsystems. The port A data register is at $0000, and the data
direction register is at $0004. Reset does not affect the data registers,
but clears the data direction registers, thereby returning the ports to
inputs. Writing a 1 to a data direction register (DDR) bit sets the
corresponding port bit to output mode. Port A has mask option enabled
pullup devices and interrupt capability by pin. For a detailed description
of I/O programming, refer to 1.8 Input/Output Programming.
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參數描述
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