38K2 datasheet(90/358 Pages) RENESAS

90 / 358 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 71 of 130

38K2 Group

REJ09B0338-0200

HARDWARE

EXB Pin Assignment

The external bus interface (EXB) pins are shown bellow.

The 38K2 group can transmit/receive a data to/from an external

MCU, using the following signals:

•Control input signal ................ 4 (ExCS, ExA0, ExRD, ExWR)

•Data input/output pin .............. 8 (DQ0 to DQ7)

•Interrupt output signal ............ 1 (ExINT)

Additionally, the DMA interface signal and the buffer status read

select signal of 38K2 group can be set up per one by the program.

•Control input signal ................ 3 (ExTC, ExDACK, ExRD, ExA1)

•Interrupt output signal ............ 1 (ExDREQ)

External chip select

External address

External read

External write

External data

External interrupt

DMA request

Terminal count

DMA acknowledge

Status read select

External pins

CPU

Multichannel RAM

External bus interface

(EXB)

38K2 group

P34/ExCS [ L ]

P37/ExA0 [address]

P36/ExRD [ L ]

P35/ExWR [ L ]

P10/DQ0/AN0—P17/DQ7/AN7 [data]

P33/ExINT [ L ]

P40/ExDREQ/RxD [ L ]

P42/ExTC/SCLK [L]

P41/ExDACK/TxD [ L ]

P43/ExA1/SRDY [H]

: Functions as normal ports

just after reset.

Fig. 105 External bus interface (EXB) pin assignment

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