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DPC31 HW

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DPC31 HW Description

M68HC16

DB 15..0

EPRO RAM

R/W

AB 23..0

R/W

IRQ

DSACK

DB 7..0

AB 12..0

Driver, Contro l Logic

Clk

XR eset

DPC31

RESET

Quartz

Scaler :2/4

12 MHz

12/24 MHz

BusType

(20)

0 1 0

(7..0)

PG(4..0), PF(7..0)

(12..0)

PH(1)

PH(0)

PG(5)

RTS_TXE

TXD _TXS

RXD_RXS

SER-

Bus

Interface

XCTS_RXA

PH(2)

PG(6)

PG(7)

Gnd

Figure 7.1-5:

M68HC16 System as an Example for Asynchronous Motorola Mode

7.1.2 IO Interface

If the DPC31 is to be operated without external processor, an I/O interface is available instead of the

processor interface (can be set via the bus type pins). This I/O interface consists of four ports (PE

7..0

, PF

7..0

, PH

2..0

). Each port bit can be configured as input or output by the internal application (C31). The

outputs can be addressed bit by bit as well as byte by byte. Reading is always byte by byte. To configure the

I/O bits, each port has a Direction Register (Dir_Reg). The output status is kept in a register bit (refer to

Table 7.1-2). After reset, all ports are switched to input. The addressing of these I/O ports is provided in

Chapter 7.3.2.

BusType

2..0

7..0

1 - -

(I/O Interface)

Dir_Reg_H

2..0

(0=Out;1=In)

Addresses:

Adr_H

2..0

=ByteAddress

Adr_H

=BitAddress

Adr_H

=BitAddress

Adr_H

=BitAddress

Dir_Reg_G

7..0

(0=Out;1=In)

Addresses:

Adr_G

7..0

=ByteAddress

Adr_G

=BitAddress

Adr_G

=BitAddress

Adr_G

=BitAddress

Adr_G

=BitAddress

Adr_G

=BitAddress

Adr_G

=BitAddress

Adr_G

=BitAddress

Adr_G

=BitAddress

Dir_Reg_F

7..0

(0=Out;1=In)

Addresses:

Adr_F

7..0

=ByteAddress

Adr_F

=BitAddress

Adr_F

=BitAddress

Adr_F

=BitAddress

Adr_F

=BitAddress

Adr_F

=BitAddress

Adr_F

=BitAddress

Adr_F

=BitAddress

Adr_F

=BitAddress

Dir_Reg_E

7..0

(0=Out;1=In)

Addresses:

Adr_E

7..0

=ByteAddress

Adr_E

=BitAddress

Adr_E

=BitAddress

Adr_E

=BitAddress

Adr_E

=BitAddress

Adr_E

=BitAddress

Adr_E

=BitAddress

Adr_E

=BitAddress

Adr_E

=BitAddress

Table 7.1-2:

IO Interface on the Processor Interface

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 93 94

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