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W78LE58P-24 Datasheet(PDF) 7 Page - Winbond |
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W78LE58P-24 Datasheet(HTML) 7 Page - Winbond |
7 / 31 page Preliminary W78LE58 Publication Release Date: June 2000 - 7 - Revision A1 Continued A8 +IE 00000000 P42AL 00000000 P42AH 00000000 P2ECON 0000xx00 AF A0 +P2 11111111 A7 98 +SCON 00000000 SBUF xxxxxxxx 9F 90 +P1 11111111 P41AL 00000000 P41AH 00000000 97 88 +TCON 00000000 TMOD 00000000 TL0 00000000 TL1 00000000 TH0 00000000 TH1 00000000 8F 80 +P0 11111111 SP 00000111 DPL 00000000 DPH 00000000 P40AL 00000000 P40AH 00000000 PCON 00110000 87 Notes: 1.The SFRs marked with a plus sign(+) are both byte- and bit-addressable. 2. The text of SFR with bold type characters are extension function registers. Port 4 Port 4, address D8H, is a 4-bit multipurpose programmable I/O port. Each bit can be configured individually by software. The Port 4 has four different operation modes. Mode 0: P4.0 −P4.3 is a bi-directional I/O port which is same as port 1. P4.2 and P4.3 also serve as external interrupt INT3 and INT2 if enabled. Mode 1: P4.0 −P4.3 are read strobe signals that are synchronized with RD signal at specified addresses. These signals can be used as chip-select signals for external peripherals. Mode 2: P4.0 −P4.3 are write strobe signals that are synchronized with WR signal at specified addresses. These signals can be used as chip-select signals for external peripherals. Mode 3: P4.0 −P4.3 are read/write strobe signals that are synchronized with RD or WR signal at specified addresses. These signals can be used as chip-select signals for external peripherals. When Port 4 is configured with the feature of chip-select signals, the chip-select signal address range depends on the contents of the SFR P4xAH, P4xAL, P4CONA and P4CONB. The registers P4xAH and P4xAL contain the 16-bit base address of P4.x. The registers P4CONA and P4CONB contain the control bits to configure the Port 4 operation mode. INT2 / INT3 Two additional external interrupts, INT2 and INT3 , whose functions are similar to those of external interrupt 0 and 1 in the standard 80C52. The functions/status of these interrupts are determined/shown by the bits in the XICON (External Interrupt Control) register. The XICON register is bit-addressable but is not a standard register in the standard 80C52. Its address is at 0C0H. To set/clear bits in the XICON register, one can use the "SETB ( CLR ) bit" instruction. For example, "SETB 0C2H" sets the EX2 bit of XICON. |
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