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參數(shù)資料
| 型號(hào)： | MC68HC912DG128C |
| 廠商： | Motorola, Inc. |
| 英文描述： | The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit |
| 中文描述： | 該MC68HC912DT128A微控制器單元（MCU）是一個(gè)16位設(shè)備的標(biāo)準(zhǔn)組成的片上外設(shè)包括一個(gè)16位中央處理單元 |
| 文件頁數(shù)： | 82/478頁 |
| 文件大?。?/td> | 2453K |
| 代理商： | MC68HC912DG128C |
Operating Modes
Technical Data
MC68HC912DT128A — Rev 4.0
82
Operating Modes
MOTOROLA
while the MCU is in special peripheral mode as internal bus
conflicts between BDM and the external master can cause
improper operation of both functions.
The MODE register controls the MCU operating mode and various
configuration options. This register is not in the map in peripheral mode
SMODN, MODB, MODA — Mode Select Special, B and A
These bits show the current operating mode and reflect the status of
the BKGD, MODB and MODA input pins at the rising edge of reset.
Read anytime.
SMODN may only be written if SMODN = 0 (in special modes) but the
first write is ignored.
MODB, MODA may be written once if SMODN = 1; anytime if SMODN
= 0 but the first write is ignored and in special peripheral and reserved
modes cannot be selected.
Bit 7
6
5
4
3
2
1
Bit 0
SMODN
MODB
MODA
ESTR
IVIS
EBSWAI
EMK
EME
RESET:
0
0
0
1
1
0
1
1
Special Single Chip
RESET:
0
0
1
1
1
0
1
1
Special Exp Nar
RESET:
0
1
0
1
1
0
1
1
Peripheral
RESET:
0
1
1
1
1
0
1
1
Special Exp Wide
RESET:
1
0
0
1
0
0
0
0
Normal Single Chip
RESET:
1
0
1
1
0
0
0
0
Normal Exp Nar
RESET:
1
1
1
1
0
0
0
0
Normal Exp Wide
MODE
— Mode Register
$000B
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