參數(shù)資料
型號: M32000D3FP
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 66.6 MHz, RISC MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù): 10/155頁
文件大小: 1340K
代理商: M32000D3FP
M32000D3FP User's Manual
POWER MANAGEMENT FUNCTION
8-3
8.2 Standby mode
In standby mode, all clock supply stops and only the contents of the internal DRAM are retained. The power
requirement is only that within the internal DRAM needs for refreshing itself. Furthermore, since the internal
DRAM refreshes itself automatically using a dedicated free-run timer, CLKIN supply is not necessary.
8.2.1 Switching to standby mode
To switch to standby mode, set the PM0 and PM1 bits of the MPMR to "11". When set to standby mode,
the M32000D3FP waits for the current bus operation to be completed (writing to external space, etc.). It
then purges the cache memory and switches the internal DRAM to self-refresh mode. After that, the PLL
__________
and all clock supplies stop and the STBY signal goes to an "L" level to indicate the completion of the switch
to standby mode.
Fig. 8.2.1 Switching to standby mode
CLKIN
STBY
BCH, BCL
D0 - D15
DC
R/W
switching period to standby mode
40 s (see note 1)
standby mode
BS
A8 - A30,
SID, ST
(see note 2)
BURST
(see note 3)
Notes 1: A maximum of 40
s is required to switch modes when the input clock frequency is 16.65 MHz.
The process below is carried out during the switching period.
complete the bus operation being executed
purge the cache memory
2: The shaded area is undefined.
3: "Hi-z" means high-impedance, and
indicates sampling timing.
The above operation is that when the state immediately before switching is idle. When the M32000D3FP
is in the hold state immediately before switching, the following pins are in high-impedance state
while switching is in progress and while the M32000D3FP is in standby mode.
Hi-z
WKUP
normal mode
(write
→ idle)
(input)
H'03 is written to
MPMR register
(see note 3)
A8 to A30, SID, ST, R/W, BCH, BCL, BS, BURST
q
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