参数资料
型号: MCHC705JJ7CPE
厂商: Freescale Semiconductor
文件页数: 118/164页
文件大小: 0K
描述: IC MCU 8BIT 224 BYTES RAM 20PDIP
标准包装: 18
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,温度传感器,WDT
输入/输出数: 14
程序存储器容量: 6KB(6K x 8)
程序存储器类型: OTP
RAM 容量: 224 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 4x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-DIP(0.300",7.62mm)
包装: 管件
Port A
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
57
PDICL — Lower Port C Pulldown Inhibit Bits (MC68HC705JP7)
Writing to this write-only bit controls the port C pulldown devices on the lower four bits (PC0–PC3).
Reading these pulldown register A bits returns undefined data. Reset clears bit PDICL.
1 = Lower four port C pins pulldown devices turned off
0 = Lower four port C pins pulldown devices turned on if pin has been programmed by the DDRC
to be an input
PDIA5–PDIA0 — Port A Pulldown Inhibit Bits
Writing to these write-only bits controls the port A pulldown devices. Reading these pulldown register
A bits returns undefined data. Reset clears bits PDIA5–PDIA0.
1 = Corresponding port A pin pulldown device turned off
0 = Corresponding port A pin pulldown device turned on if pin has been programmed by the DDRA
to be an input
7.2.4 Port A External Interrupts
The PIRQ bit in the MOR enables the PA3–PA0 pins to serve as external interrupt pins in addition to the
IRQ/VPP pin. The active interrupt state for the PA3–PA0 pins is a logic 1 or a rising edge. A state of the
PIRQ bit in the MOR determines whether external interrupt inputs are edge-sensitive only or both edge-
and level-sensitive. Port A interrupts are also interactive with each other and the IRQ/VPP pin as described
NOTE
When testing for external interrupts, the BIH and BIL instructions test the
voltage on the IRQ/VPP pin, not the state of the internal IRQ signal.
Therefore, BIH and BIL cannot test the port A external interrupt pins.
7.2.5 Port A Logic
When a PA0:PA5 pin is programmed as an output, reading the port bit actually reads the value of the data
latch and not the voltage on the pin itself. When a PA0:PA5 pin is programmed as an input, reading the
port bit reads the voltage level on the pin. The data latch can always be written, regardless of the state of
its DDR bit. Figure 7-4 shows the I/O logic of PA0–PA5 pins of port A.
The data latch can always be written, regardless of the state of its DDR bits. Table 7-1 summarizes the
operations of the port A pins.
Table 7-1. Port A Pin Functions
Port A
Pin(s)
SWPDI
(in MOR)
Port A
PORTA Access
(Pin or Data Register)
Result on
Port A Pins
PDIAx
DDRAx(1)
1. DDRA can always be read or written.
Read
Write
Pulldown
Pin
PA0
PA1
PA2
PA3
PA4
PA5
000
Pin
Data
On
PAx in
010
Pin
Data
Off
PAx in
1
X
0
Pin
Data
Off
PAx in
X(2)
2. Don’t care
X(2)
1
Data
Off
PAx out
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