參數(shù)資料
型號(hào): PSD4235G2-90UT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 16 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁(yè)數(shù): 72/100頁(yè)
文件大小: 933K
代理商: PSD4235G2-90UT
73/100
PSD4235G2
Input Control Signals
The PSD provides the option to turn off the ad-
dress input (A7-A0) and input control signals
(CNTL0, CNTL1, CNTL2, Address Strobe (ALE/
AS, PD0) and Write Enable High-byte (WRH/DBE,
PD3)) to the PLD to save AC power consumption.
These signals are inputs to the PLD AND Array.
During Power-down mode, or, if any of them are
not being used as part of the PLD logic equation,
these control signals should be disabled to save
AC power. They are disconnected from the PLD
AND Array by setting Bits 0, 2, 3, 4, 5 and 6 to a ’1’
in PMMR2.
Table 50. APD Counter Operation
APD Enable Bit
ALE PD Polarity
ALE Level
APD Counter
0
X
Not Counting
1
X
Pulsing
Not Counting
1
Counting (Generates PDN after 15 Clocks)
1
0
Counting (Generates PDN after 15 Clocks)
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