參數(shù)資料
型號: PSD4XX
廠商: 意法半導(dǎo)體
英文描述: Low Cost Field Programmable Microcontroller Peripherals
中文描述: 低成本現(xiàn)場可編程微控制器外圍設(shè)備
文件頁數(shù): 53/123頁
文件大?。?/td> 657K
代理商: PSD4XX
PSD4XX Famly
50
Port Mode
Port A
Port B
Port C
Port D
Port E
Standard MCU I/O
Yes
Yes
Yes
Yes
Yes
PLD I/O
Yes
Yes
Input Only
*
Input Only
*
Yes
*
Address Out
Yes
Yes
Yes
Yes
Yes
Address In
Yes
Yes
**
Yes
**
Yes
**
Data Port
Yes
Yes
Alternate Function In
Yes
Peripheral I/O
Yes
Open Drain
Yes
Yes
*
PSD4XXA2 and ZPSD4XXA2 Only.
**
For external decoding. Cannot be latched by ALE
9.3.7 Peripheral I/O
This mode enables the microcontroller to read or write to a peripheral though Port A. When
there is no read/write operation, Port A is tri-stated. One of the applications of Peripheral
I/O is in a DMA based design.
J
Configuration
1.Declare the pins used as pheripheral I/O in the ABEL file.
2.Write logic equations for PSEL0 and PSEL1.
3.Write a “1” to the PIO bit in the VM Register to activate the Peripheral I/O operation.
See the section on Peripheral I/O for a detailed description.
9.3.8 Open Drain Outputs
This mode enables the user to configure Ports C and D pins as open drain outputs. CMOS
output is the default configuration. Writing “1” to the corresponding bit in the Open Drain
Register changes the pin to open drain output.
Table 12. Operating Modes of the I/OPorts
Table 12 summarizes the operating modes of the I/O ports. Not all the functions are
available to every port.
The PSD4XX
Architecture
(cont.)
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