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TSC87C52-20IKR 参数 Datasheet PDF下载

TSC87C52-20IKR图片预览
型号: TSC87C52-20IKR
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS 0至33 MHz的可编程的8位微控制器 [CMOS 0 to 33 MHz Programmable 8?bit Microcontroller]
分类和应用: 微控制器和处理器
文件页数/大小: 24 页 / 184 K
品牌: TEMIC [ TEMIC SEMICONDUCTORS ]
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TSC87C52  
New and Enhanced Features  
In comparison to the original 80C52, the TSC87C52 implements some new and enhanced features. The new features  
are the Power Off Flag, the ONCE mode and the ALE disabling. The enhanced features are located in the UART and  
the Timer 2.  
Power Off Flag  
The Power Off Flag allows the user to distinguish between a ‘cold start’ reset and a ‘warm start’ reset.  
A cold start reset is one that is coincident with VCC being turned on to the device after it was turned off. A warm start  
reset occurs while VCC is still applied to the device and could be generated for example by an exit from Power Down.  
The Power Off Flag (POF) is located in PCON at bit location 4 (see Table 1). POF is set by hardware when VCC rises  
from 0 to its nominal voltage. The POF can be set or cleared by software allowing the user to determine the type of  
reset.  
Table 1 PCON – Power Control Register (87h)  
7
6
5
4
3
2
1
0
SMOD1  
SMOD0  
POF  
GF1  
GF0  
PD  
IDL  
Symbol  
Description  
SMOD1  
Serial Port Mode bit 1, new name of SMOD bit  
Set to select double baud rate in mode 1,2 or 3.  
SMOD0  
Serial Port Mode bit 0  
Set to to select FE bit in SCON.  
Clear to select SM0 bit in SCON.  
Reserved  
Do not write 1 in this bit.  
POF  
Power Off Flag  
Set by hardware when VCC rises from 0 to its nominal voltage. Can also be set by software.  
Clear by software to recognize next reset type.  
GF1  
GF0  
PD  
General purpose Flag  
Set by software for general purpose usage.  
Clear by software for general purpose usage.  
General purpose Flag  
Set by software for general purpose usage.  
Clear by software for general purpose usage.  
Power Down mode bit  
Set to enter power down mode.  
Clear by hardware when reset occurs.  
IDL  
Idle mode bit  
Set to enter idle mode.  
Clear by hardware when interrupt or reset occur.  
The reset value of PCON is 00XX 0000b.  
ONCE Mode  
The ONCE mode facilitates testing and debugging of systems using TSC87C52 without the TSC87C52 having to be  
removed from the circuit. The ONCE mode is invoked by driving certain pins of the TSC87C52, the following sequence  
must be exercised.  
D
D
Pull ALE low while the device is in reset (RST high) and PSEN is high.  
Hold ALE low as RST is deactivated.  
MATRA MHS  
Rev. C – 10 Sept 1997  
6
Preliminary