參數(shù)資料
型號(hào)： EM6617VVVST11A
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 0.032768 MHz, RISC MICROCONTROLLER
封裝： STICKY TAPE
文件頁(yè)數(shù)： 41/66頁(yè)
文件大?。?/td> 759K
代理商： EM6617VVVST11A
EM6617-1
EM Microlectronic-Marin SA , 3/99 Rev. B/258
41
14. RAM
The EM6617-1 has two 64x4 bit RAM’s built-in.
The main RAM (RAM1) is direct addressable on addresses decimal(0 to 63). A second RAM (RAM2) is indirect
addressable on addresses 64,65, 66 and 67 together with the index from RegIndexAdr.
The RAM2 addressing is indirect using the
RegIndexAdr
value
as an offset to the directly addressed base
RAM2_0
,
RAM2_1
,
RAM2_2
or RAM2_3
registers.
To write or read the RAM2 the user has first to set the offset value in the
RegIndexAdr
register. The actual
access then is made on the RAM2 base addresses
RAM2_0 , RAM2_1, RAM2_2
or
RAM2_3.
Refer to
Figure 30. Ram Architecture, for the address mapping.
i.e. Writing hex(5) to Ram2 add location 30: First write hex(E) to RegIndexAdr, then write hex(5) to RAM2_1
RAM Extension :
Unused R/W Registers can often be used as possible RAM extension. Be careful not to use
register which start, stop, or reset some functions.
Figure 30. Ram Architecture
RAM1_63
RAM1_62
RAM1_61
RAM1_60
4 bit R/W
4 bit R/W
...
4 bit R/W
4 bit R/W
RegIndexAdr[F]
RegIndexAdr[E]
...
RegIndexAdr[1]
RegIndexAdr[0]
RAM1_0
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
4 bit R/W
.
.
.
.
.
.
RAM1_3
RAM1_2
RAM1_1
RAM2_3
RAM2_2
RAM2_1
4 bit R/W
4 bit R/W
4 bit R/W
RAM2_0
4 bit R/W
4 bit R/W
...
4 bit R/W
4 bit R/W
RegIndexAdr[F]
RegIndexAdr[E]
...
RegIndexAdr[1]
RegIndexAdr[0]
4 bit R/W
4 bit R/W
...
4 bit R/W
4 bit R/W
RegIndexAdr[F]
RegIndexAdr[E]
...
RegIndexAdr[1]
RegIndexAdr[0]
4 bit R/W
4 bit R/W
...
4 bit R/W
4 bit R/W
RegIndexAdr[F]
RegIndexAdr[E]
...
RegIndexAdr[1]
RegIndexAdr[0]
64 x 4 indexed addressable RAM2
64 x 4 direct addressable RAM1
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