参数资料
型号: MCHC705JJ7CPE
厂商: Freescale Semiconductor
文件页数: 117/164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
Parallel Input/Output
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
56
Freescale Semiconductor
7.2.2 Data Direction Register A
The contents of the port A data direction register (DDRA) determine whether each port A pin is an input
or an output. Writing a logic 1 to a DDRA bit enables the output buffer for the associated port A pin. A
DDRA bit set to a logic 1 also disables the pulldown device for that pin. Writing a logic 0 to a DDRA bit
disables the output buffer for the associated port A pin. The upper two bits always read as logic 0s. A reset
initializes all DDRA bits to logic 0s, configuring all port A pins as inputs and disabling the voltage
comparators from driving PA4 or PA5.
DDRA5–DDRA0 — Port A Data Direction Bits
These read/write bits control port A data direction. Reset clears the DDRA5–DDRA0 bits.
1 = Corresponding port A pin configured as output and pulldown device disabled
0 = Corresponding port A pin configured as input
7.2.3 Pulldown Register A
All port A pins can have software programmable pulldown devices enabled or disabled globally by SWPDI
bit in the MOR. These pulldown devices are controlled by the write-only pulldown register A (PDRA)
shown in Figure 7-3. Clearing the PDIA5–PDIA0 bits in the PDRA turns on the pulldown devices if the port
A pin is an input. Reading the PDRA returns undefined results since it is a write-only register; therefore,
do not change the value in PDRA with read/modify/write instructions. On the MC68HC705JP7 the PDRA
contains two pulldown control bits (PDICH and PDICL) for port C. Reset clears the PDIA5–PDIA0, PDICH,
and PDICL bits, which turns on all the port A and port C pulldown devices.
PDICH — Upper Port C Pulldown Inhibit Bits (MC68HC705JP7)
Writing to this write-only bit controls the port C pulldown devices on the upper four bits (PC4–PC7).
Reading these pulldown register A bits returns undefined data. Reset clears bit PDICH.
1 = Upper four port C pins pulldown devices turned off
0 = Upper four port C pins pulldown devices turned on if pin has been programmed by the DDRC
to be an input
Address:
$0004
Bit 7
654321
Bit 0
Read:
0
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
00000000
= Unimplemented
Figure 7-2. Data Direction Register A (DDRA)
Address:
$0010
Bit 7
654321
Bit 0
Read:
Write:
PDICH
PDICL
PDIA5
PDIA4
PDIA3
PDIA2
PDIA1
PDIA0
Reset:
00000000
= Unimplemented
Figure 7-3. Pulldown Register A (PDRA)
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