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| 型号： | MC68HC11ED0CP2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 2 MHz, MICROCONTROLLER, PDIP40 |
| 封装： | PLASTIC, DIP-40 |
| 文件页数： | 51/108页 |
| 文件大小： | 1672K |
| 代理商： | MC68HC11ED0CP2 |
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Operating Modes and On-Chip Memory
Mode Selection
MC68HC11ED0 — Rev. 1.0
Technical Summary
Operating Modes and On-Chip Memory
RBOOT — Read Bootstrap ROM Bit
Valid only when SMOD is set (bootstrap or special test mode); can be
written only in special modes
0 = Bootloader ROM disabled and not in map
1 = Bootloader ROM enabled and in map at $BE00–$BFFF
SMOD and MDA — Special Mode Select and Mode Select A Bits
The initial value of SMOD is the inverse of the logic level present on
the MODB pin at the rising edge of reset. The initial value of MDA
equals the logic level present on the MODA pin at the rising edge of
reset. These two bits can be read at any time. They can be written any
time in special modes. MDA can be written only once in normal
modes. SMOD cannot be set once it has been cleared.
CAUTION:
Unlike other M68HC11 Family devices, the MC68HC11ED0 will not
function in single-chip operating mode. If MODA is pulled low and MODB
is pulled high at the rising edge of reset (the condition that causes most
Address:
$003C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
RBOOT(1) SMOD(1)
MDA(1)
IRVNE(1)
PSEL3
PSEL2
PSEL1
PSEL0
Write:
Resets:
Expanded:
Bootstrap:
Special Test:
0
1
0
1
0
1
0
1
0
1
0
1
1. The reset values depend on the mode selected at power-up.
Figure 4-2. Highest Priority I-Bit Interrupt
and Miscellaneous Register (HPRIO)
Input
Mode
Latched at Reset
MODB MODA
SMOD
MDA
10
High-impedance state ADDR/DATA
(CPU held in reset)
00
1
Expanded
0
1
0
Bootstrap
1
0
1
Special test
1
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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