參數(shù)資料
型號(hào)： PSD913390MIT
廠商： 意法半導(dǎo)體
英文描述： Flash In-System Programmable ISP Peripherals For 8-bit MCUs
中文描述： Flash在系統(tǒng)可編程ISP的外設(shè)的8位微控制器
文件頁(yè)數(shù)： 63/110頁(yè)
文件大?。?/td> 1737K
代理商： PSD913390MIT
63/110
PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2
Automatic Power-down (APD) Unit and Power-down Mode
The APD Unit, shown in Figure
32
, puts the PSD
into Power-down mode by monitoring the activity
of Address Strobe (ALE/AS, PD0). If the APD Unit
is enabled, as soon as activity on Address Strobe
(ALE/AS, PD0) stops, a four bit counter starts
counting. If Address Strobe (ALE/AS, PD0) re-
mains inactive for fifteen clock periods of CLKIN
(PD1), Power-down (PDN) goes High, and the
PSD 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
PSD is in Power-down mode:
–
If Address Strobe (ALE/AS, PD0) starts
pulsing again, the PSD returns to normal
Operating mode. The PSD also returns to
normal Operating mode if either PSD Chip
Select Input (CSI, PD2) is Low or the Reset
(RESET) input is High.
–
The MCU address/data bus is blocked from all
memory and PLDs.
–
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.
All PSD 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 PSD ports.
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 32. APD Unit
Table 29. PSD 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 V
CC
3V V
CC
Power-down
Normal t
PD
(Note
1
)
No Access
t
LVDV
75μA (Note
2
)
25μA (Note
2
)
APD EN
PMMR0 BIT 1=1
ALE
RESET
CSI
CLKIN
TRANSITION
DETECTION
EDGE
DETECT
APD
COUNTER
POWER DOWN
(PDN)
SELECT
DISABLE BUS
INTERFACE
EEPROM SELECT
FLASH SELECT
SRAM SELECT
PD
CLR
PD
DISABLE
FLASH/EEPROM/SRAM
PLD
AI02891
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