Mode 3: In mode 3 (single-chip mode), when the host interface enable bit (HIE) is cleared to 0 in
the system control register (SYSCR), port 3 is a general-purpose input/output port. A pin becomes
an output pin when its P3DDR bit is set to 1, and an input pin when this bit is cleared to 0.
When the HIE bit is set to 1, selecting slave mode, port 3 becomes the host interface data bus
(HDB7 to HDB0). For details, see section 14, Host Interface.
Figure 7.11 shows the pin functions in mode 3.
P37 (input/output)/HDB7 (input/output)*
P36 (input/output)/HDB6 (input/output)*
P35 (input/output)/HDB5 (input/output)*
P34 (input/output)/HDB4 (input/output)*
Port 3
P33 (input/output)/HDB3 (input/output)*
P32 (input/output)/HDB2 (input/output)*
P31 (input/output)/HDB1 (input/output)*
P30 (input/output)/HDB0 (input/output)*
Note: * The HDB7 to HDB0 pin functions apply to the H8/3337 Series only. The H8/3397 Series
does not support a host interface, and therefore has no HDB7 to HDB0 pin functions.
Figure 7.11 Pin Functions in Mode 3 (Port 3)
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RENESAS [ RENESAS TECHNOLOGY CORP ]
