參數(shù)資料
型號: PSD402A2-C-15L
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 32K X 16 UVPROM, 40 I/O, PIA-GENERAL PURPOSE, CQCC68
封裝: WINDOWED, CERAMIC, LCC-68
文件頁數(shù): 73/123頁
文件大?。?/td> 755K
代理商: PSD402A2-C-15L
Obsolete
Product(s)
- Obsolete
Product(s)
PSD4XX Family
50
PSD4XX Family
Port Mode
Port A
Port B
Port C
Port D
Port E
Standard MCU I/O
Yes
PLD I/O
Yes
Input Only
* Input Only*
Yes
*
Address Out
Yes
Address In
Yes
**
Yes
**
Yes
**
Data Port
Yes
Alternate Function In
Yes
Peripheral I/O
Yes
Open Drain
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.
t 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/O Ports
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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