参数资料
型号: MC68HC711D3MP2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP40
封装: PLASTIC, DIP-40
文件页数: 72/157页
文件大小: 2252K
代理商: MC68HC711D3MP2
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Operating Modes and Memory
21
Data Sheet — MC68HC711D3
Section 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.
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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