SAF-C164SM Infineon Technologies, SAF-C164SM Datasheet - Page 170

• Manufacturer Part Number: SAF-C164SM
• Description: 16-Bit CMOS Microcontroller
• Manufacturer: Infineon Technologies

9
Although the C164CM provides a powerful set of on-chip peripherals and on-chip RAM
and ROM/OTP/Flash (except for ROMless versions) areas, these internal units cover
only a small fraction of its address space of up to 16 MBytes. The External Bus Interface
allows access to external peripherals and additional volatile and non-volatile memory.
The External Bus Interface supports a variety of configurations so it can be tailored to fit
perfectly into a given application system.
Figure 9-1
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 / ALE / RW delay). These parameters are used for accesses within a
specific address area as defined via the corresponding register ADDRSELx.
The four pairs BUSCON1/ADDRSEL1 … BUSCON4/ADDRSEL4 allow definition of four
independent “address windows”, while all external accesses outside these windows are
controlled via register BUSCON0.
User’s Manual
P0L/P0H
P1L/P1H
ADDRSELx Address Range Select
Ports & Direction Control
Alternate Functions
P0L / P0H
P1L / P1H
External Bus Interface
PORT0 Data Register
PORT1 Data Register
Register 1...4
SFRs and Port Pins Associated with the External Bus Interface
PORT0
PORT1
RD
WR
Address Registers
ADDRSEL1
ADDRSEL2
ADDRSEL3
ADDRSEL4
EA
RSTIN
ALE
9-1
BUSCONx
SYSCON
RP0H
BUSCON0
BUSCON1
BUSCON2
BUSCON3
BUSCON4
Mode Registers
Bus Mode Control Register 0...4
System Control Register
Port P0H Reset Configuration Register
External Bus Interface
C164CM/C164SM
Control Registers
SYSCON
RP0H
Derivatives
V1.0, 2002-02
MCA05127