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參數(shù)資料
| 型號： | MC68HC11D3CFN2 |
| 廠商： | ABILIS SYSTEMS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 53/138頁 |
| 文件大?。?/td> | 1047K |
| 代理商： | MC68HC11D3CFN2 |
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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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