Section 8 I/O Ports - Renesas H8S/2100 Series Hardware Manual

Section 8 I/O Ports

Section 8 I/O Ports
Table 8.1 lists the port functions. The pins of each port also have other functions such as
input/output pins of on-chip peripheral modules or interrupt input pins. Each I/O port includes a
data direction register (DDR) that controls input/output, a data register (DR) that stores output
data, and a port input data register (PIN) used to read the pin states. Port E does not have a DDR
or a DR register.
Ports 1 to 3, 6, 9, B to D, F, and H have internal input pull-up MOSs and a pull-up MOS control
register (PCR) controls the on/off state of the input pull-up MOSs.
In addition, ports 1 to 3, C, and D can drive a LED (5 mA sink current). P52, P97, ports A and G
are NMOS push-pull outputs and 5-V tolerant inputs. PE4 and PE2 to PE0 are 5-V tolerant inputs.
Rev. 1.00 May 09, 2008 Page 149 of 954
REJ09B0462-0100