mc68hc11d0cfn2 Freescale Semiconductor, Inc, mc68hc11d0cfn2 Datasheet - Page 21

• Manufacturer Part Number: mc68hc11d0cfn2
• Description: M68hc11 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

2.1 Introduction
2.2 Operating Modes
2.2.1 Single-Chip Mode
MC68HC711D3 — Rev. 2
MOTOROLA
Data Sheet — MC68HC711D3
This section contains information about:
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.
values encoded on the MODA and MODB pins, and the value latched in the SMOD
and MDA bits.
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.
RESET
•
•
•
1
1
1
1
0
Freescale Semiconductor, Inc.
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)
For More Information On This Product,
MODA
0
1
0
1
0
Operating Modes and Memory
Go to: www.freescale.com
MODB
1
1
0
0
0
Section 2. Operating Modes and Memory
Table 2-1. Mode Selection
Normal — single chip
Normal — expanded multiplexed
Special — bootstrap (BOOT)
Special — test
Reserved
Table 2-1
Mode Selected
shows mode selection according to the
SMOD
X
0
0
1
1
Data Sheet
MDA
X
0
1
0
1
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