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TSC80251G2D-24CB 参数 Datasheet PDF下载

TSC80251G2D-24CB图片预览
型号: TSC80251G2D-24CB
PDF下载: 下载PDF文件 查看货源
内容描述: 8位/ 16位微控制器,串行通信接口 [8/16-bit Microcontroller with Serial Communication Interfaces]
分类和应用: 微控制器外围集成电路异步传输模式ATM通信时钟
文件页数/大小: 63 页 / 813 K
品牌: TEMIC [ TEMIC SEMICONDUCTORS ]
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TSC80251G2D  
6.4 Configuration Bytes  
The TSC80251G2D derivatives provide user design flexibility by configuring certain operating features at device  
reset. These features fall into the following categories:  
external memory interface (Page mode, address bits, programmed wait states and the address range for RD#,  
WR#, and PSEN#)  
source mode/binary mode opcodes  
selection of bytes stored on the stack by an interrupt  
mapping of the upper portion of on-chip code memory to region 00:  
Two user configuration bytes UCONFIG0 (see Figure 7) and UCONFIG1 (see Figure 8) provide the information.  
When EA# is tied to a low level, the configuration bytes are fetched from the external address space. The  
TSC80251G2D derivatives reserve the top eight bytes of the memory address space (FF:FFF8h-FF:FFFFh) for an  
external 8-byte configuration array. Only two bytes are actually used: UCONFIG0 at FF:FFF8h and UCONFIG1  
at FF:FFF9h.  
For the mask ROM devices, configuration information is stored in on-chip memory (see ROM Verifying). When  
EA# is tied to a high level, the configuration information is retrieved from the on-chip memory instead of the  
external address space and there is no restriction in the usage of the external memory.  
UCONFIG0  
Configuration Byte 0  
7
-
6
5
4
3
2
1
0
WSA1#  
WSA0#  
XALE#  
RD1  
RD0  
PAGE#  
SRC  
Bit Number Bit Mnemonic  
Description  
Reserved  
7
-
Set this bit when writing to UCONFIG0.  
Wait State A bits  
Select the number of wait states for RD#, WR# and PSEN# signals for external memory accesses  
(all regions except 01:).  
6
WSA1#  
WSA1#  
WSA0#  
Number of Wait States  
0
0
1
1
0
1
0
1
3
2
1
0
5
4
WSA0#  
XALE#  
Extend ALE bit  
Clear to extend the duration of the ALE pulse from T  
to 3·T  
OSC.  
OSC  
Set to minimize the duration of the ALE pulse to 1·T  
.
OSC  
Memory Signal Select bits  
3
2
RD1  
RD0  
Specify a 18-bit, 17-bit or 16-bit external address bus and the usage of RD#, WR# and PSEN#  
signals (see Table 13).  
(1)  
Page Mode Select bit  
1
0
PAGE#  
SRC  
Clear to select the faster Page mode with A15:8/D7:0 on Port 2 and A7:0 on Port 0.  
Set to select the non-Page mode with A15:8 on Port 2 and A7:0/D7:0 on Port 0.  
(2)  
Source Mode/Binary Mode Select bit  
Clear to select the binary mode.  
Set to select the source mode.  
Notes:  
1. UCONFIG0 is fetched twice so it can be properly read both in Page or Non-Page modes. If P2.1 is cleared during the first data fetch, a  
Page mode configuration is used, otherwise the subsequent fetches are performed in Non-Page mode.  
2. This selection provides compatibility with the standard 80C51 hardware which is multiplexing the address LSB and the data on Port 0.  
Figure 7. Configuration Byte 0  
14  
Rev. A - May 7, 1999  
 
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