參數(shù)資料
型號: MC68711E20VFNE2
廠商: Freescale Semiconductor
文件頁數(shù): 53/138頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 52-PLCC
標(biāo)準(zhǔn)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 大小: 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
21
Chapter 2
Operating Modes and Memory
2.1 Introduction
This section contains information about:
The modes that define MC68HC711D3 operating conditions
The on-chip memory that allows the microcontroller unit (MCU) to be configured for various
applications
The 4-Kbytes of programmable read-only memory (PROM)
2.2 Operating Modes
The MC68HC711D3 uses two dedicated pins, MODA and MODB, to select one of two normal operating
modes or one of two special operating modes. A value reflecting the microcontroller unit (MCU) status or
mode selected is latched on bits SMOD and MDA of the highest priority I-bit interrupt and miscellaneous
register (HPRIO) on the rising edge of reset. The normal operating modes are the single-chip and
expanded-multiplexed modes. The special operating modes are the bootstrap and test modes. Table 2-1
shows mode selection according to the values encoded on the MODA and MODB pins, and the value
latched in the SMOD and MDA bits.
2.2.1 Single-Chip Mode
In single-chip mode, the MCU functions as a self-contained microcontroller and has no external address
or data bus. The 4-Kbyte erasable programmable read-only memory (EPROM) would contain all program
code and is located at $F000–$FFFF. This mode provides maximum use of the pins for on-chip peripheral
functions, and all the address and data activity occurs within the MCU.
2.2.2 Expanded Multiplexed Mode
In the expanded-multiplexed mode, the MCU can address up to 64 Kbytes of address space. High-order
address bits are output on the port B pins. Low-order address bits and the bidirectional data bus are
multiplexed on port C. The AS pin provides the control output used in demultiplexing the low-order
address. The R/W pin is used to control the direction of data transfer on the port C bus.
Table 2-1. Mode Selection
RESET
MODA
MODB
Mode Selected
SMOD
MDA
1
0
1
Normal — single chip
0
1
Normal — expanded multiplexed
0
1
0
Special — bootstrap (BOOT)
1
0
1
0
Special — test
1
0
Reserved
X
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