參數(shù)資料
型號： uPSD3251
廠商： 意法半導(dǎo)體
英文描述： Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設(shè)備)
中文描述： 閃存可編程系統(tǒng)設(shè)備與8032微控制器內(nèi)核（帶8032微控制器內(nèi)核的閃存可編程系統(tǒng)設(shè)備）
文件頁數(shù)： 106/128頁
文件大小： 1566K
代理商： UPSD3251
μPSD3251F
106/128
PLD Power Management
The power and speed of the PLDs are controlled
by the Turbo Bit (Bit 3) in PMMR0 (see Table 77).
By setting the bit to '1,' the Turbo Mode is off and
the PLDs consume the specified standby current
when the inputs are not switching for an extended
time of 70ns. The propagation delay time is in-
creased by 10ns (for a 5V device) after the Turbo
Bit is set to '1' (turned off) when the inputs change
at a composite frequency of less than 15MHz.
When the Turbo Bit is reset to '0' (turned on), the
PLDs run at full power and speed. The Turbo Bit
affects the PLD
’
s DC power, AC power, and prop-
agation delay. When the Turbo Mode is off, the
μPSD3200 input clock frequency is reduced by
5MHz from the maximum rated clock frequency.
Blocking MCU control signals with the bits of
PMMR2 (see Table 78, page 107) can further re-
duce PLD AC power consumption.
SRAM Standby Mode (Battery Backup).
The
SRAM in the PSD Module supports a battery back-
up mode in which the contents are retained in the
event of a power loss. The SRAM has Voltage
Standby (V
STBY
, PC2) that can be connected to an
external battery. When V
CC
becomes lower than
V
STBY
then the SRAM automatically connects to
Voltage Standby (V
STBY
, PC2) as a power source.
The SRAM Standby Current (I
STBY
) is typically 0.5
μA. The SRAM data retention voltage is 2V mini-
mum. The Battery-on Indicator (V
BATON
) can be
routed to PC4. This signal indicates when the V
CC
has dropped below V
STBY
.
Input Clock
CLKIN (PD1) can be turned off, to the PLD to save
AC power consumption. CLKIN (PD1) is an input
to the PLD AND Array and the Output Macrocells
(OMC).
During Power-down Mode, or, if CLKIN (PD1) is
not being used as part of the PLD logic equation,
the clock should be disabled to save AC power.
CLKIN (PD1) is disconnected from the PLD AND
Array or the Macrocells block by setting Bits 4 or 5
to a '1' in PMMR0.
Input Control Signals
The PSD Module provides the option to turn off the
MCU signals (WR, RD, PSEN, and Address
Strobe (ALE)) to the PLD to save AC power con-
sumption (see Table 79, page 107). These control
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 con-
trol signals should be disabled to save AC power.
They are disconnected from the PLD AND Array
by setting Bits 2, 3, 4, 5, and 6 to a '1' in PMMR2.
Table 77. Power Management Mode Registers PMMR0
Bit 0
X
0
Not used, and should be set to zero.
Bit 1
APD Enable
0 = off Automatic Power-down (APD) is disabled.
1 = on Automatic Power-down (APD) is enabled.
Bit 2
X
0
Not used, and should be set to zero.
Bit 3
PLD Turbo
0 = on PLD Turbo Mode is on
1 = off
PLD Turbo Mode is off, saving power.
μPSD3200 operates at 5MHz below the maximum rated clock frequency
Bit 4
PLD Array clk
0 = on
CLKIN (PD1) input to the PLD AND Array is connected. Every change of CLKIN
(PD1) Powers-up the PLD when Turbo Bit is '0.'
1 = off CLKIN (PD1) input to PLD AND Array is disconnected, saving power.
Bit 5
PLD MCell clk
0 = on CLKIN (PD1) input to the PLD macrocells is connected.
1 = off CLKIN (PD1) input to PLD macrocells is disconnected, saving power.
Bit 6
X
0
Not used, and should be set to zero.
Bit 7
X
0
Not used, and should be set to zero.
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