Functions Of I/O Ports - Fujitsu MB90335 Series Hardware Manual

CHAPTER 8 I/O PORT

8.1 Functions of I/O Ports

8.1 Functions of I/O Ports
The overview of the I/O ports is shown.
■ Functions of I/O Ports
The I/O port outputs data from the CPU to the I/O pin and loads the signal input in the I/O pin in the CPU
by using the port data register (PDR). In addition, the port can randomly set the direction of the input/
output of the I/O pin in bit unit by the port direction register (DDR).
The MB90335 Series has 37 input/output pins and 8 open drain output pins.
P07 to P00, P17 to P10, P27 to P20,P47 to P40, and P54 to P50 are I/O ports. P67 to P60 are N-ch open
drain pins.
164 FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
CM44-10137-6E