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W78E365A40LL Datasheet(PDF) 10 Page - Winbond |
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W78E365A40LL Datasheet(HTML) 10 Page - Winbond |
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10 / 43 page  W78E365/W78E365A - 10 - W78E365 Special Function Registers (SFRs) and Reset Values, continued B8 +IP 00000000 CHPCON 0xx00000 B0 +P3 00000000 P43AL 00000000 P43AH 00000000 A8 +IE 00000000 P42AL 00000000 P42AH 00000000 P4CSIN 00000000 A0 +P2 11111111 XRAMAH 00000000 98 +SCON 00000000 SBUF xxxxxxxx 90 +P1 11111111 P41AL 00000000 P41AH 00000000 88 +TCON 00000000 TMOD 00000000 TL0 00000000 TL1 00000000 TH0 00000000 TH1 00000000 AUXR 00000000 WDTC 00000000 80 +P0 11111111 SP 00000111 DPL 00000000 DPH 00000000 P40AL 00000000 P40AH 00000000 POR 00000000 PCON 00110000 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. 6.6 Port 4 Port 4, address D8H, is a 8-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 PSENand 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. |
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