参数资料
型号: MC68HC705P6ACDW
厂商: Freescale Semiconductor
文件页数: 7/98页
文件大小: 0K
描述: IC MCU 2.1MHZ 4.5K OTP 28-SOIC
标准包装: 26
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 2.1MHz
连通性: SIO
外围设备: POR,WDT
输入/输出数: 21
程序存储器容量: 4.5KB(4.5K x 8)
程序存储器类型: OTP
RAM 容量: 176 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 4x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 管件
Functional Pin Description
MC68HC705P6A Advance Information Data Sheet, Rev. 2.1
Freescale Semiconductor
15
1.3 Functional Pin Description
The following paragraphs describe the functionality of each pin on the MC68HC705P6A package. Pins
connected to subsystems described in other chapters provide a reference to the chapter instead of a
detailed functional description.
1.3.1 V
DD and VSS
Power is supplied to the MCU through VDD and VSS. VDD is connected to a regulated +5 volt supply and
VSS is connected to ground.
Very fast signal transitions occur on the MCU pins. The short rise and fall times place very 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. Use bypass capacitors with good high-frequency
characteristics and position them as close to the MCU as possible. Bypassing requirements vary,
depending on how heavily the MCU pins are loaded.
1.3.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the control connections for the on-chip oscillator. The OSC1 and OSC2
pins can accept the following:
1.
A crystal as shown in Figure 1-2(a)
2.
A ceramic resonator as shown in Figure 1-2(a)
3.
An external clock signal as shown in Figure 1-2(b)
The frequency, fosc, of the oscillator or external clock source is divided by two to produce the internal bus
clock operating frequency, fop. The oscillator cannot be turned off by software unless the MOR bit, SWAIT,
is clear when a STOP instruction is executed.
Figure 1-2. Oscillator Connections
To VDD (or STOP)
(a)
Crystal or Ceramic
Resonator Connections
(b)
External Clock Source
Connections
OSC1
OSC2
MCU
37 pF
4.7 M
MCU
OSC1
OSC2
UNCONNECTED
EXTERNAL CLOCK
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