38K0 datasheet(70/328 Pages) RENESAS

70 / 328 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 05, 2006

page 53 of 112

38K0 Group

REJ09B0337-0200

HARDWARE

EXB Pin Assignment

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

The 38K0 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 38K0 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)

38K0 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. 75 External bus interface (EXB) pin assignment

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