参数资料
型号: MC68HC705P6ACP
厂商: Freescale Semiconductor
文件页数: 35/98页
文件大小: 0K
描述: IC MCU 2.1MHZ 4.5K OTP 28-DIP
标准包装: 13
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-DIP(0.600",15.24mm)
包装: 管件
Input/Output Ports
MC68HC705P6A Advance Information Data Sheet, Rev. 2.1
40
Freescale Semiconductor
NOTE
To avoid generating a glitch on an I/O port pin, data should be written to the
I/O port data register before writing a logic 1 to the corresponding data
direction register.
At power-on or reset, all DDRs are cleared, which configures all port pins as inputs. The DDRs are
capable of being written to or read by the processor. During the programmed output state, a read of the
data register will actually read the value of the output data latch and not the level on the I/O port pin.
Table 6-1. Port A I/O Functions
DDRA
I/O Pin Mode
Accesses to
DDRA @ $0004
Accesses to Data
Register @ $0000
Read/Write
Read
Write
0
IN, Hi-Z
DDRA0–DDRA7
I/O Pin
See Note
1
OUT
DDRA0–DDRA7
PA0–PA7
Note: Does not affect input, but stored to data register
Table 6-2. Port B I/O Functions
DDRB
I/O Pin Mode
Accesses to
DDRB @ $0005
Accesses to Data
Register @ $0001
Read/Write
Read
Write
0
IN, Hi-Z
DDRB5–DDRB7
I/O Pin
See Note
1
OUT
DDRB5–DDRB7
PB5–PB7
Note: Does not affect input, but stored to data register
Table 6-3. Port C I/O Functions
DDRC
I/O Pin Mode
Accesses to
DDRC @ $0006
Accesses to Data
Register @ $0002
Read/Write
Read
Write
0
IN, Hi-Z
DDRC0–DDRC7
I/O Pin
See Note
1
OUT
DDRC0–DDRC7
PC0–PC7
Note: Does not affect input, but stored to data register
Table 6-4. Port D I/O Functions
DDRD
I/O Pin Mode
Accesses to
DDRD @ $0007
Accesses to Data
Register @ $0003
Read/Write
Read
Write
0
IN, Hi-Z
DDRD5
I/O Pin
See Note 1
1
OUT
DDRD5
PD5
Notes:
1. Does not affect input, but stored to data register
2. PD7 is input only
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