C167CS datasheet(209/517 Pages) INFINEON

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C167CS

Derivatives

The External Bus Interface

User’s Manual

9-21

V2.0, 2000-07

Note: Register SYSCON cannot be changed after execution of the EINIT instruction.

Bit SGTDIS controls the correct stack operation (push/pop of CSP or not) during

traps and interrupts.

The layout of the BUSCON registers and ADDRSEL registers is identical (respectively).

Registers BUSCON4 … BUSCON1, which control the selected address windows, are

completely under software control, while register BUSCON0, which e.g. is also used for

the very first code access after reset, is partly controlled by hardware, i.e. it is initialized

via PORT0 during the reset sequence. This hardware control allows to define an

appropriate external bus for systems, where no internal program memory is provided.

CSCFG

Chip Select Configuration Control (Cleared after reset)

Latched CS mode. The CS signals are latched internally

and driven to the (enabled) port pins synchronously.

Unlatched CS mode. The CS signals are directly derived from

the address and driven to the (enabled) port pins.

WRCFG

Write Configuration Control (Configured via pin P0H.0 upon a reset)

Pins WR and BHE retain their normal function

Pin WR acts as WRL, pin BHE acts as WRH

CLKEN

System Clock Output Enable (CLKOUT, cleared after reset)

CLKOUT disabled: pin may be used for FOUT or gen. purpose IO

CLKOUT enabled: pin outputs the system clock signal

BYTDIS

Disable/Enable Control for Pin BHE (Set according to data bus width)

Pin BHE enabled

Pin BHE disabled, pin may be used for general purpose IO

ROMEN

Internal ROM Enable (Set according to pin EA during reset)

Internal program memory disabled,

accesses to the ROM area use the external bus

Internal program memory enabled

SGTDIS

Segmentation Disable/Enable Control (Cleared after reset)

Segmentation enabled

(CSP is saved/restored during interrupt entry/exit)

Segmentation disabled (Only IP is saved/restored)

ROMS1

Internal ROM Mapping

Internal ROM area mapped to segment 0 (00’0000H … 00’7FFFH)

Internal ROM area mapped to segment 1 (01’0000H … 01’7FFFH)

STKSZ

System Stack Size

Selects the size of the system stack (in the internal RAM)

from 32 to 1024 words

Bit

Function

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