38K0 Datasheet, PDF (52/133 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

38K0 Group
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)
38K0 group
External pins
External chip select
External address
External read
External write
External data ⁸
External interrupt
External bus interface
(EXB)
P34/ExCS [ L ]
P37/ExA0 [address]
P36/ExRD [ L ]
P35/ExWR [ L ]
P10/DQ0/AN0—P17/DQ7/AN7 [data]
P33/ExINT [ L ]
DMA request
Terminal count
DMA acknowledge
Status read select
P40/ExDREQ/RxD [ L ]
P42/ExTC/SCLK [ L ]
P41/ExDACK/TxD [ L ]
P43/ExA1/SRDY [ H ]
: Functions as normal ports
just after reset.
CPU
Multichannel RAM
Fig. 75 External bus interface (EXB) pin assignment
Rev.3.00 Oct 05, 2006 page 52 of 129
REJ03B0192-0300