參數(shù)資料
型號: MC68711E20VFNE2
廠商: Freescale Semiconductor
文件頁數(shù): 97/138頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 52-PLCC
標準包裝: 23
系列: HC11
核心處理器: HC11
芯體尺寸: 8-位
速度: 4MHz
連通性: SCI,SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 38
程序存儲器容量: 20KB(20K x 8)
程序存儲器類型: OTP
EEPROM 大?。?/td> 512 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 105°C
封裝/外殼: 52-LCC(J 形引線)
包裝: 管件
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
61
Chapter 5
Input/Output (I/O) Ports
5.1 Introduction
The MC68HC711D3 has four 8-bit input/output (I/O) ports; A, B, C, and D. In the 40-pin version, port A
bits 4 and 6 are not bonded. Port functions are controlled by the particular mode of operation selected, as
In the single-chip and bootstrap modes, all the ports are configured as parallel input/output (I/O) data
ports. In expanded multiplexed and test modes, ports B, C, and lines D6 (AS) and D7 (R/W) are
configured as a memory expansion bus, with:
Port B as the high-order address bus
Port C as the multiplexed address and data bus
AS as the demultiplexing signal
R/W as data bus direction control
The remaining ports are unaffected by mode changes.
Ports A and D can be used as general-purpose I/O ports, though each has an alternate function.
Port A bits handle the timer functions.
Port D handles serial peripheral interface (SPI) and serial communications interface (SCI)
functions in addition to its bus direction control functions.
5.2 Port A
Port A shares functions with the timer system and has:
Three input only pins
Three output only pins
Two bidirectional I/O pins
Pins PA6 and PA4 are not bonded in the 40-pin dual in-line package (DIP), and their OC output functions
are unavailable, but their software interrupts are available.
Address:
$0000
Bit 7
654321
Bit 0
Read:
PA7
PA6(1)
PA5
PA4(1)
PA3
PA2
PA1
PA0
Write:
Reset:
Hi-Z
0
Hi-Z
Alt. Func.:
And/Or:
PAI
OC1
OC2
OC1
OC3
OC1
OC4
OC1
IC4/OC5
OC1
IC1
IC2
IC3
1. This pin is not bonded in the 40-pin version.
Figure 5-1. Port A Data Register (PORTA)
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