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| 型號(hào)： | MC68HC705JB2P |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁(yè)數(shù)： | 77/128頁(yè) |
| 文件大?。?/td> | 2493K |
| 代理商： | MC68HC705JB2P |
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GENERAL RELEASE SPECIFICATION
August 28, 1998
INPUT/OUTPUT PORTS
MC68HC705JB2
7-6
REV 1.1
7.3
I/O PORT PROGRAMMING
All I/O pins can be programmed as inputs or outputs, with or without pulldown/
pullup devices.
7.3.1 Pin Data Direction
The direction of a pin is determined by the state of its corresponding bit in the
associated port Data Direction Register (DDR). A pin is congured as an output if
its corresponding DDR bit is set to a logic one. A pin is congured as an input if its
corresponding DDR bit is cleared to a logic zero.
The data direction bits DDRB0 thru DDRB2 and DDRA0 thru DDRA7 are read/
write bits which can be manipulated with read-modify-write instructions. At power-
on or reset, all DDR’s are cleared which congures all port pins as inputs. If the
pulldown/up mask option is chosen, all pins will initially power-up with their
software programmable Pulldown/ups enabled.
7.3.2 Output Pin
When an I/O pin is programmed as an output pin, the state of the corresponding
data register bit will determine the state of the pin. The state of the data register
bits can be altered by writing to address $0000 for Port A and address $0001 for
Port B. Reads of the corresponding data register bit at address $0000 or $0001
will return the state of the data register bit (not the state of the I/O pin itself).
Therefore bit manipulation is possible on all pins programmed as outputs.
If the corresponding bit in the pulldown/up register is clear (and the pulldown/up
mask option is chosen), only output pins with pullups have an activated pullup
device connected to the pin. For those pins with pulldowns and congured as
output pins, the pulldowns will be inactivated regardless of the state of the
corresponding pulldown/up register bit. Since the pulldown/up register bits are
write-only, bit manipulation should not be used on these register bits.
7.3.3 Input Pin
When an I/O pin is programmed as an input pin, the state of the pin can be
determined by reading the corresponding data register bit. Any writes to the
corresponding data register bit for an input pin will be ignored in the sense that the
written value will not be reected on the pin, rather it is only reected in the port
If the corresponding bit in the pulldown/up register is clear (and the pulldown/up
mask option is chosen) the input pin will also have an activated pulldown/up
device. Since the pulldown/up register bits are write-only, bit manipulation should
not be used on these register bits.
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For More Information On This Product,
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC705JB4DW | 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC705JJ7CDW | 功能描述:IC MCU 8BIT 20-SOIC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC705JP7CDW | 功能描述:IC MCU 8BIT 28-SOIC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC705JP7CP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述: |
| MC68HC705K1CDW | 制造商:Motorola Inc 功能描述: |
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