參數(shù)資料
型號(hào)： SAF-C502-2RP
廠商： SIEMENS A G
元件分類： 微控制器/微處理器
英文描述： 8-Bit CMOS Microcontroller
中文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PDIP40
文件頁(yè)數(shù)： 23/46頁(yè)
文件大?。?/td> 567K
代理商： SAF-C502-2RP
Semiconductor Group
22
Additional On-Chip RAM - XRAM
The SAB-C502 contains another 256byte of On-Chip RAM additional to the 256bytes internal RAM.
This RAM is called XRAM (‘eXtended RAM’) in this document.
The additional ON-Chip RAM is logically located in the external data memory range. The highbyte
of the XRAM address range startaddress is programmable by SFR XCON (94H). The reset value of
XCON is 0F8H (that is, XRAM address range F800HH … F8FFH).
The contents of the XRAM is not affected by a reset. After power up the contents is undefined, while
it remains unchanged during and after reset as long as the power supply is not turned off. The
XRAM is controlled by SFR SYSCON as shown in
table 8
.
Table 8
Control of the XRAM
Because of the XRAM is used in the same way as external data memory the same instruction types
must be used for accessing the XRAM. A general overview gives
table 9
.
Table 9
Accessing the XRAM
Note:
When writing the page address (in page mode) at Port2 the value is also written in XPAGE.
However when writing XPAGE the value at PORT2 is not changed!
The behaviour of Port0/Port2 and RD/WR during MOVX accesses is shown in
table 10
.
SFR SYSCON
Description
XMAP1
XMAP0
0
1
Resetvalue. Access to XRAM is disabled. When cleared it can
be set again only by a reset
0
0
XRAM enabled
1
0
XRAM enabled. The signals RD and WR are activated during
accesses to XRAM
Instruction
using
Instruction
Remarks
DPTR
MOVX A @DPTR
MOVX @ DPTR,A
Normally the use of these instructions would use a
physically external memory. However, in the SAB-C502
the XRAM is accessed if it is enabled.
R0/R1
(page mode)
MOVX A, @Ri
MOVX@Ri,A
Normally Port 2 serves as page register. However, the
distinction, whether Port 2 is as general purpose I/O or
as “page address” is made by the external design.
Hence a special SFR XPAGE is implemented the serve
the same function for the XRAM as Port 2 for external
data memory.
C502
相關(guān)PDF資料
PDF描述
SAF-C502-L20N 8-Bit CMOS Microcontroller
SAF-C502-L20P 8-Bit CMOS Microcontroller
SAF-C502-LN 8-Bit CMOS Microcontroller
SAF-C502-LP 8-Bit CMOS Microcontroller
SAB-C502-L20P 8-Bit CMOS Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAF-C502-L20N 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAF-C502-L20P 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAF-C502-LN 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAF-C502-LP 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAFC503 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
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