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TSC87C52-16IJD Fiches technique(PDF) 6 Page - TEMIC Semiconductors |
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TSC87C52-16IJD Fiches technique(HTML) 6 Page - TEMIC Semiconductors |
6 / 24 page TSC87C52 6 Rev. C – 10 Sept 1997 Preliminary MATRA MHS 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) 765432 10 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 General purpose Flag Set by software for general purpose usage. Clear by software for general purpose usage. GF0 General purpose Flag Set by software for general purpose usage. Clear by software for general purpose usage. PD 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 Pull ALE low while the device is in reset (RST high) and PSEN is high. D Hold ALE low as RST is deactivated. |
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