參數(shù)資料
型號(hào)： PSD813F2-15JT
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQCC52
封裝： PLASTIC, LCC-52
文件頁(yè)數(shù)： 59/103頁(yè)
文件大?。?/td> 1180K
代理商： PSD813F2-15JT
59/103
PSD8XXF2/3/4/5
Automatic Power-down (APD) Unit and Power-
down Mode. The APD Unit, shown in Figure 29,
puts the PSD8XXFX into Power-down mode by
monitoring the activity of Address Strobe (ALE/AS,
PD0). If the APD Unit is enabled, as soon as activ-
ity on Address Strobe (ALE/AS, PD0) stops, a four
bit counter starts counting. If Address Strobe
(ALE/AS, PD0) remains inactive for fifteen clock
periods of CLKIN (PD1), Power-down (PDN) goes
High, and the PSD8XXFX enters Power-down
mode, as discussed next.
Power-down Mode. By default, if you enable the
APD Unit, Power-down mode is automatically en-
abled. The device enters Power-down mode if Ad-
dress Strobe (ALE/AS, PD0) remains inactive for
fifteen periods of CLKIN (PD1).
The following should be kept in mind when the
PSD8XXFX is in Power-down mode:
s
If Address Strobe (ALE/AS, PD0) starts pulsing
again, the PSD8XXFX returns to normal
Operating mode. The PSD8XXFX also returns
to normal Operating mode if either PSD Chip
Select Input (CSI, PD2) is Low or the Reset
(RESET) input is High.
s
The MCU address/data bus is blocked from all
memory and PLDs.
s
Various signals can be blocked (prior to Power-
down mode) from entering the PLDs by setting
the appropriate bits in the PMMR registers. The
blocked signals include MCU control signals
and the common CLKIN (PD1). Note that
blocking CLKIN (PD1) from the PLDs does not
block CLKIN (PD1) from the APD Unit.
s
All PSD8XXFX memories enter Standby mode
and are drawing standby current. However, the
PLD and I/O ports blocks do
not go into Standby
Mode because you don’t want to have to wait for
the logic and I/O to “wake-up” before their
outputs can change. See Table 28 for Power-
down mode effects on PSD8XXFX ports.
s
Typical standby current is of the order of
microamperes. These standby current values
assume that there are no transitions on any PLD
input.
Table 28. Power-down Mode’s Effect on Ports
Figure 29. APD Unit
Table 29. PSD8XXFX Timing and Stand-by Current during Power-down Mode
Note: 1. Power-down does not affect the operation of the PLD. The PLD operation in this mode is based only on the Turbo bit.
2. Typical current consumption assuming no PLD inputs are changing state and the PLD Turbo bit is 0.
Port Function
Pin Level
MCU I/O
No Change
PLD Out
No Change
Address Out
Undefined
Data Port
Tri-State
Peripheral I/O
Tri-State
Mode
PLD Propagation
Delay
Memory
Access Time
Access Recovery Time
to Normal Access
Typical Stand-by Current
5V VCC
3V VCC
Power-down
Normal tPD (Note
1)
No Access
tLVDV
75 A (Note 2)
25 A (Note 2)
APD EN
PMMR0 BIT 1=1
ALE
RESET
CSI
CLKIN
TRANSITION
DETECTION
EDGE
DETECT
APD
COUNTER
POWER DOWN
(PDN)
DISABLE BUS
INTERFACE
EEPROM SELECT
FLASH SELECT
SRAM SELECT
PD
CLR
PD
DISABLE
FLASH/EEPROM/SRAM
PLD
SELECT
AI02891
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