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參數資料
| 型號： | DSPB56007FJ50 |
| 英文描述： | DSP|24-BIT|CMOS|QFP|80PIN|PLASTIC |
| 中文描述： | 數字信號處理器| 24位|的CMOS | QFP封裝| 80腳|塑料 |
| 文件頁數： | 22/83頁 |
| 文件大小： | 382K |
| 代理商： | DSPB56007FJ50 |
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1-16
DSP56007/D
MOTOROLA
Signal/Connection Descriptions
General Purpose I/O
GENERAL PURPOSE I/O
ON-CHIP EMULATION (OnCE
TM
) PORT
There are four signals associated with the OnCE port controller and its serial
interface.
Table 1-11
General Purpose I/ O (GPIO) Signals
Signal
Name
Signal
Type
State during
Reset
Signal Description
GPIO0–
GPIO3
Standard
Output,
Open-drain
Output, or
Input
Disconnected
GPIO lines can be used for control and handshake
functions between the DSP and external circuitry.
Each GPIO line can be configured individually as
disconnected, open-drain output, standard output,
or an input.
Note:
Hardware reset or software reset configures all
the GPIO lines as disconnected (external
circuitry connected to these pins may need pull-
ups until the pins are configured for operation).
Table 1-12
On-Chip Emulation Port Signals
Signal
Name
Signal
Type
State during
Reset
Signal Description
DSI
OS0
Input
Output
Output,
Driven Low
Debug Serial Input (DSI)
—The DSI signal is the signal
through which serial data or commands are provided to the
OnCE port controller. The data received on the DSI signal
will be recognized only when the DSP has entered the
Debug mode of operation. Data must have valid TTL logic
levels before the serial clock falling edge. Data is always
shifted into the OnCE port Most Significant Bit (MSB) first.
Operating Status 0 (OS0)—
When the DSP is not in the Debug
mode, the OS0 signal provides information about the DSP
status if it is an output and used in conjunction with the OS1
signal. When switching from output to input, the signal is
tri-stated.
Note:
If the OnCE port is in use, an external pull-down resistor
should be attached to the DSI/ OS0 signal. If the OnCE
port is not in use, the resistor is not required.
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