参数资料
型号: MC68HC05J1AVDWR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 38/126页
文件大小: 1118K
代理商: MC68HC05J1AVDWR2
General Description
Pin Assignments
MC68HC05J1A — Rev. 1.0
Technical Data
MOTOROLA
General Description
19
1.6 Pin Assignments
Figure 1-2 shows the MC68HC05J1A pin assignments.
Figure 1-2. Pin Assignments
1.6.1 VDD and VSS
VDD and VSS are the power supply and ground pins. The MCU operates
from a single 5-V power supply.
Very fast signal transitions occur on the MCU pins, placing high
short-duration current demands on the power supply. To prevent noise
problems, take special care to provide good power supply bypassing at
the MCU. Place bypass capacitors as close to the MCU as possible, as
Figure 1-3 shows. C2 is an optional bulk current bypass capacitor for
use in applications that require the port pins to source high current
levels.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OSC1
OSC2
PB5
PB4
PB3
PB2
PB1
PB0
VDD
VSS
RESET
IRQ
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
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