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參數(shù)資料
| 型號： | MC68HC05C5CFN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 58/58頁 |
| 文件大?。?/td> | 166K |
| 代理商： | MC68HC05C5CFN |
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Page 3
Section 1: Introduction
MOTOROLA
MC68HC05C5 Specification Rev. 1.2
NOTE:
Negative true signals like RESET and IRQ will be denoted with either an
asterisk or an overline.
1.4
SIGNAL DESCRIPTION
1.4.1
V
DD
AND V
SS
Power is supplied to the microcontroller using these two pins. V
DD
is the positive supply,
and V
SS
is ground.
1.4.2
PE
PE is the Program Enable for the EEPROM. This pin has a very weak internal pullup. If
this pin is held at a logic "1" level or left not connected, the EEPROM can be programmed
and erased. If this pin is held at a logic "0" level, EEPROM programming and erasing is
disabled. The pullup will not be able to pull the pin high if any circuit is connected to PE.
1.4.3
IRQ
This pin has a mask option that provides two different choices of interrupt triggering
sensitivity. The IRQ pin contains an internal Schmitt trigger as part of its input to improve
noise immunity. Refer to 4.5 INTERRUPTS for more detail.
1.4.4
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
providing 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.
1.4.5
RESET
This active low pin is used to reset the MCU to a known start-up state by pulling RESET
low. The RESET pin contains an internal Schmitt trigger as part of its input to improve
noise immunity.
1.4.6
TCAP
This pin controls the input capture feature for the on-chip programmable timer. The TCAP
pin contains an internal Schmitt trigger as part of its input to improve noise immunity.
1.4.7
PA0-PA7
These eight I/O lines comprise port A. The state of any pin is software programmable and
all port A lines are configured as input during power-on or reset. Refer to 5.5 INPUT/
OUTPUT PROGRAMMING for a detailed description of I/O programming.
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