C164CL datasheet(72/484 Pages) INFINEON

72 / 484 page

C164CI/C164SI

Derivatives

Central Processing Unit (CPU)

User’s Manual

4-14

V3.1, 2002-02

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

The function of bits VISIBLE, WRCFG, BYTDIS, ROMEN and ROMS1 is

described in more detail in Chapter 9.

CLKEN

System Clock Output Enable (CLKOUT)

CLKOUT disabled: pin may be used for general purpose IO or

for signal FOUT

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

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 512 words

Bit

Function

C164CL Datasheet(PDF) 72 Page - Infineon Technologies AG