C167CS datasheet(189/517 Pages) INFINEON

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C167CS

Derivatives

The External Bus Interface

User’s Manual

9-1

V2.0, 2000-07

The External Bus Interface

Although the C167CS provides a powerful set of on-chip peripherals and on-chip RAM

and ROM/OTP/Flash (except for ROMless versions) areas, these internal units only

cover a small fraction of its address space of up to 16 MByte. The external bus interface

allows to access external peripherals and additional volatile and non-volatile memory.

The external bus interface provides a number of configurations, so it can be tailored to

fit perfectly into a given application system.

Figure 9-1

SFRs and Port Pins Associated with the External Bus Interface

Accesses to external memory or peripherals are executed by the integrated External Bus

Controller (EBC). The function of the EBC is controlled via the SYSCON register and the

BUSCONx and ADDRSELx registers. The BUSCONx registers specify the external bus

cycles in terms of address (mux/demux), data width (16-bit/8-bit), chip selects and length

(waitstates/READY control/ALE/RW delay). These parameters are used for accesses

within a specific address area which is defined via the corresponding register

ADDRSELx.

The four pairs BUSCON1/ADDRSEL1 … BUSCON4/ADDRSEL4 allow to define four

independent “address windows”, while all external accesses outside these windows are

controlled via register BUSCON0.

MCA04367

P0L / P0H

P1L / P1H

DP3

ADDRSEL1

ADDRSEL2

ADDRSEL3

BUSCON0

SYSCON

Ports & Direction Control

Alternate Functions

Address Registers

Mode Registers

Control Registers

P0L/P0H PORT0 Data Register

P1L/P1H PORT1 Data Register

DP3

Port 3 Direction Control Register

Port 3 Data Register

Port 4 Data Register

ODP6

Port 6 Open Drain Control Register

DP6

Port 6 Direction Control Register

Port 6 Data Register

ADDRSELx

Address Range Select Register 1...4

BUSCONx

Bus Mode Control Register 0...4

SYSCON

System Control Register

RP0H

Port P0H Reset Configuration Register

RP0H

PORT0 EA

PORT1 RSTIN

ALE READY

WR/WRL

BHE/WRH

BUSCON1

BUSCON3

BUSCON2

ODP6

DP6

ADDRSEL4

BUSCON4

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