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IS80C32-40PLI Datasheet(PDF) 9 Page - Integrated Silicon Solution, Inc |
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IS80C32-40PLI Datasheet(HTML) 9 Page - Integrated Silicon Solution, Inc |
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9 / 48 page  IS80C52 IS80C32 Integrated Silicon Solution, Inc. — 1-800-379-4774 9 MC004-1D 11/19/98 ISSI® SPECIAL FUNCTION REGISTERS (continued) Stack Pointer (SP) The Stack Pointer Register is eight bits wide. It is incremented before data is stored during PUSH and CALL executions. While the stack may reside anywhere in on-chip RAM, the Stack Pointer is initialized to 07H after a reset. This causes the stack to begin at location 08H. Data Pointer (DPTR) The Data Pointer consists of a high byte (DPH) and a low byte (DPL). Its function is to hold a 16-bit address. It may be manipulated as a 16-bit register or as two independent 8-bit registers. Ports 0 To 3 P0, P1, P2, and P3 are the SFR latches of Ports 0, 1, 2, and 3, respectively. Serial Data Buffer (SBUF) The Serial Data Buffer is actually two separate registers, a transmit buffer and a receive buffer register. When data is moved to SBUF, it goes to the transmit buffer, where it is held for serial transmission. (Moving a byte to SBUF initiates the transmission.) When data is moved from SBUF, it comes from the receive buffer. Timer Registers Register pairs (TH0, TL0), (TH1, TL1), and (TH2, TL2) are the 16-bit Counter registers for Timer/Counters 0, 1, and 2, respectively. Capture Registers The register pair (RCAP2H, RCAP2L) are the Capture registers for the Timer 2 Capture Mode. In this mode, in response to a transition at the IS80C52/32's T2EX pin, TH2 and TL2 are copied into RCAP2H and RCAP2L. Timer 2 also has a 16-bit auto-reload mode, and RCAP2H and RCAP2L hold the reload value for this mode. Control Registers Special Function Registers IP, IE, TMOD, TCON, T2CON, SCON, and PCON contain control and status bits for the interrupt system, the Timer/Counters, and the serial port. They are described in later sections of this chapter. |
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