HD6432142 datasheet(305/1177 Pages) RENESAS

305 / 1177 page

Section 8 I/O Ports

Rev. 4.00 Sep 27, 2006 page 261 of 1130

REJ09B0327-0400

When the ABW bit in WSCR is cleared to 0, pin P90 becomes a bus control output (

LWR),

regardless of the input/output direction indicated by P90DDR. When the ABW bit is 1, pin P90

becomes an output port if P90DDR is set to 1, and an input port if P90DDR is cleared to 0.

• Modes 2 and 3 (EXPE = 0)

When the corresponding P9DDR bits are set to 1, pin P96 functions as the

φ output pin and

pins P97 and P95 to P90 become output ports. When P9DDR bits are cleared to 0, the

corresponding pins become input ports.

Port 9 Data Register (P9DR)

Bit

765

432

P97DR

P96DR

P95DR

P94DR

P93DR

P92DR

P91DR

P90DR

Initial value

—*

000

Read/Write

R/W

Note:

Determined by the state of pin P96.

P9DR is an 8-bit readable/writable register that stores output data for the port 9 pins (P97 to P90).

With the exception of P96, if a port 9 read is performed while P9DDR bits are set to 1, the P9DR

values are read directly, regardless of the actual pin states. If a port 9 read is performed while

P9DDR bits are cleared to 0, the pin states are read.

P9DR is initialized to H'00 by a reset and in hardware standby mode. It retains its prior state in

software standby mode.

8.10.3

Pin Functions

Port 9 pins also function as external interrupt input pins (

IRQ0 to IRQ2), the A/D converter trigger

input pin (

ADTRG), HIF input pins (ECS2, CS1, IOW, IOR), the IIC0 I/O pin (SDA0), the

subclock input pin (EXCL), bus control signal I/O pins (

AS/IOS, RD, HWR, LWR, WAIT), and

the system clock (

φ) output pin. The pin functions differ between the mode 1, 2, and 3 (EXPE = 1)

expanded modes and the mode 2 and 3 (EXPE = 0) single-chip modes. The port 9 pin functions

are shown in table 8.21.

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