參數(shù)資料
型號: PSD854F2V-15M
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52
封裝: PLASTIC, QFP-52
文件頁數(shù): 68/109頁
文件大?。?/td> 908K
代理商: PSD854F2V-15M
Obsolete
Product(s)
- Obsolete
Product(s)
61/109
PSD813F2V, PSD854F2V
Doc ID 10552 Rev 3
External Chip Select
The CPLD also provides three External Chip Se-
lect (ECS0-ECS2) outputs on Port D pins that can
be used to select external devices. Each External
Chip Select (ECS0-ECS2) consists of one product
term that can be configured active High or Low.
The output enable of the pin is controlled by either
the output enable product term or the Direction
Register. (See Figure 31.)
Figure 31. Port D External Chip Select Signals
PLD
INPUT
BUS
POLARITY
BIT
PD2 PIN
PT2
ECS2
DIRECTION
REGISTER
POLARITY
BIT
PD1 PIN
PT1
ECS1
ENABLE (.OE)
DIRECTION
REGISTER
POLARITY
BIT
PD0 PIN
PT0
ECS0
ENABLE (.OE)
DIRECTION
REGISTER
CPLD
AND
ARRAY
AI02890
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