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MC68HC11P1CFN3 参数 Datasheet PDF下载

MC68HC11P1CFN3图片预览
型号: MC68HC11P1CFN3
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器 [Microcontrollers]
分类和应用: 微控制器
文件页数/大小: 268 页 / 2323 K
品牌: FREESCALE [ Freescale ]
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Freescale Semiconductor, Inc.  
Pin Descriptions  
outputs. Writes to PORTA do not change the pin state when the pins are  
configured for timer output compares.  
Out of reset, port A pins [7:0] are general-purpose high-impedance  
inputs. When the functions associated with these pins are disabled, the  
bits in DDRA govern the I/O state of the associated pin. For further  
information, refer to Parallel Input/Output.  
2.13.2 Port B  
Port B is an 8-bit general-purpose I/O port with a data register (PORTB)  
and a data direction register (DDRB). In single chip mode, port B pins are  
general-purpose I/O pins (PB[7:0]). In expanded mode, port B pins act  
as the high-order address lines (A[15:8]) of the address bus.  
PORTB can be read at any time: inputs return the pin level; outputs  
return the pin driver input level. If PORTB is written, the data is stored in  
internal latches. The pins are driven only if they are configured as  
outputs in single chip or bootstrap mode. For further information, refer to  
Parallel Input/Output.  
Port B pins include on-chip pull-up devices which can be enabled or  
disabled.  
2.13.3 Port C  
Port C is an 8-bit general-purpose I/O port with a data register (PORTC)  
and a data direction register (DDRC). In single chip mode, port C pins  
are general-purpose I/O pins (PC[7:0]). In the expanded mode, port C  
pins are configured as data bus pins (D[7:0]).  
PORTC can be read at any time: inputs return the pin level; outputs  
return the pin driver input level. If PORTC is written, the data is stored in  
internal latches. The pins are driven only if they are configured as  
outputs in single chip or bootstrap mode. Port C pins are general-  
purpose inputs out of reset in single chip and bootstrap modes. In  
expanded and test modes, these pins are data bus lines out of reset.  
Technical Data  
MC68HC11P2 — Rev 1.0  
Pin Descriptions  
For More Information On This Product,  
Go to: www.freescale.com