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型號：	S83C154DXXX-30D
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 30 MHz, MICROCONTROLLER, PQCC44
文件頁數(shù)：	166/1021頁
文件大小：	15196K
代理商：	S83C154DXXX-30D

32072H–AVR32–10/2012

AT32UC3A3

Figure 16-7. Refresh Cycle Followed by a Read Access

Power Management

Three low power modes are available:

Self refresh mode: the SDRAM executes its own auto refresh cycles without control of the

SDRAMC. Current drained by the SDRAM is very low.

Power-down mode: auto refresh cycles are controlled by the SDRAMC. Between auto refresh

cycles, the SDRAM is in power-down. Current drained in power-down mode is higher than in

self refresh mode.

Deep power-down mode (only available with mobile SDRAM): the SDRAM contents are lost,

but the SDRAM does not drain any current.

The SDRAMC activates one low power mode as soon as the SDRAM device is not selected. It is

possible to delay the entry in self refresh and power-down mode after the last access by config-

uring the Timeout field in the Low Power Register (LPR.TIMEOUT).

Self refresh mode

This mode is selected by writing the value one to the Low Power Configuration Bits field in the

SDRAMC Low Power Register (LPR.LPCB). In self refresh mode, the SDRAM device retains

data without external clocking and provides its own internal clocking, thus performing its own

auto refresh cycles. All the inputs to the SDRAM device become “don’t care” except SDCKE,

which remains low. As soon as the SDRAM device is selected, the SDRAMC provides a

sequence of commands and exits self refresh mode.

Some low power SDRAMs (e.g., mobile SDRAM) can refresh only one quarter or a half quarter

or all banks of the SDRAM array. This feature reduces the self refresh current. To configure this

feature, Temperature Compensated Self Refresh (TCSR), Partial Array Self Refresh (PASR)

SDRAMC_A[12:0]

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
S83C154-L16	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S83C154T-12	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S83C154T-16	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S83C154T-20	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S83C154T-25	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller

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