參數(shù)資料
型號(hào): DSP56F803E
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: 16-bit Digital Signal Controllers
中文描述: 16位數(shù)字信號(hào)控制器
文件頁數(shù): 12/52頁
文件大?。?/td> 414K
代理商: DSP56F803E
56F803 Technical Data, Rev. 15
12
Freescale Semiconductor
2.5 Interrupt and Program Control Signals
Table 2-7 Data Bus Signals
No. of
Pins
Signal
Name
Signal
Type
State During
Reset
Signal Description
16
D0–D15
Input/O
utput
Tri-stated
Data Bus
— D0–D15 specify the data for external Program or Data
memory accesses. D0–D15 are tri-stated when the external bus is
inactive. Internal pull-ups may be active.
Table 2-8 Bus Control Signals
No. of
Pins
Signal
Name
Signal
Type
State During
Reset
Signal Description
1
PS
Output
Tri-stated
Program Memory Select
—PS is asserted low for external Program memory
access.
1
DS
Output
Tri-stated
Data Memory Select
—DS is asserted low for external Data memory access.
1
WR
Output
Tri-stated
Write Enable
—WR is asserted during external memory write cycles. When
WR is asserted low, pins D0–D15 become outputs and the device puts data
on the bus. When WR is deasserted high, the external data is latched inside
the external device. When WR is asserted, it qualifies the A0–A15, PS, and
DS pins. WR can be connected directly to the WE pin of a Static RAM.
1
RD
Output
Tri-stated
Read Enable
—RD is asserted during external memory read cycles. When
RD is asserted low, pins D0–D15 become inputs and an external device is
enabled onto the device data bus. When RD is deasserted high, the external
data is latched inside the controller. When RD is asserted, it qualifies the
A0–A15, PS, and DS pins. RD can be connected directly to the OE pin of a
Static RAM or ROM.
Table 2-9 Interrupt and Program Control Signals
No. of
Pins
Signal
Name
Signal
Type
State During
Reset
Signal Description
1
IRQA
Input
(Schmitt)
Input
External Interrupt Request A
—The IRQA input is a synchronized
external interrupt request indicating an external device is requesting
service. It can be programmed to be level-sensitive or
negative-edge- triggered.
1
IRQB
Input
(Schmitt)
Input
External Interrupt Request B
—The IRQB input is an external
interrupt request indicating an external device is requesting service.
It can be programmed to be level-sensitive or
negative-edge-triggered.
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