HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 426

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

15.1
There are two ports, A and B. Ports A and B are 16-bit I/O ports. The pins of the ports are all
multiplexed for use as general-purpose I/Os or for other functions. (Use the pin function controller
(PFC) to select the function of multiplexed pins.) Ports A and B each have one data register for
storing pin data.
15.2
Port A is a 16-pin input/output port, as shown in figure 15.1. The PA3/CS7/WAIT pin of port A
has a pull-up MOS so that when it is functioning as a WAIT pin, the wait state control register of
the bus state controller can be used to select whether to pull up the WAIT pin or not. It is not
pulled up when the pin is functioning as either PA3 or CS7.
15.2.1
Table 15.1 summarizes the port A register.
Overview
Port A
Register Configuration
Port A
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
Section 15 Parallel I/O Ports
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
(Input/output)/AH (Output)/IRQOUT (Output)
(Input/output)/BREQ (Input)
(Input/output)/BACK (Output)
(Input/output)/RD (Output)
(Input/output)/WRH (Output) (LBS (Output))
(Input/output)/WRL (Output) (WR (Output))
(Input/output)/CS7 (Output)/WAIT (Input)
(Input/output)/CS6 (Output)/TIOCB0 (Input/output)
(Input/output)/CS5 (Output)/RAS (Output)
(Input/output)/CS4 (Output)/TIOCA0 (Input/output)
(Input/output)/IRQ3 (Input)/DREQ1 (Input)
(Input/output)/IRQ2 (Input)/DACK1 (Output)
(Input/output)/IRQ1 (Input)/DREQ0 (Input)/TCLKB (Input)
(Input/output)/IRQ0 (Input)/DACK0 (Output)/TCLKA (Input)
(Input/output)/DPH (Input/output)/TIOCB1 (Input/output)
(Input/output)/DPL (Input/output)/TIOCA1 (Input/output)
Figure 15.1 Port A Configuration
HITACHI 415