p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 203

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 8 I/O Ports
8.4
Port 4
Port 4 is an 8-bit I/O port. Port 4 pins also function as external interrupt input pins, the A/D
converter input pins, the IIC_0 I/O pins, the subclock input pins, bus control signal I/O pins, and
the system clock (φ) output pins. P47 is an NMOS push-pull output. SDA0 is an NMOS open-
drain output, and has direct bus drive capability. Port 4 has the following registers.
• Port 4 data direction register (P4DDR)
• Port 4 data register (P4DR)
• Port 4 pull-up MOS control register (P4PCR)
• Port 4 noise canceller enable register (P4NCE)
• Port 4 noise canceller determine control register (P4NCMC)
• Port 4 noise canceller cycle setting register (P4NCCS)
Rev. 1.00 Sep. 21, 2006 Page 165 of 658
REJ09B0310-0100