Z8932320FSC datasheet(29/60 Pages) ZILOG

29 / 60 page

Z89223/273/323/373

ZiLOG

16-Bit Digital Signal Processors with A/D Converter

DS000202-DSP0599

BANK/EXT REGISTER ASSIGNMENTS

There are 16 different Banks of EXT registers. Control of

the bank switching is done via the EXT7 register. The same

EXT7 register exists in all Banks.

Banks 0–5 support different combinations of external reg-

isters for external peripherals, and external registers for in-

ternal (on-chip) peripherals. Use the bank that offers the op-

timum combination of internal and external registers to

support the application. Use it as a preferred working bank

to minimize bank switching.

Banks 6–12 only decode EXT6 and EXT7. Do not use

EXT0–5 for Banks 6–12.

Banks 13–15 are control register banks. These banks are

used in the initialization routines and whenever a configu-

ration change is required. Refer to the sections on I/O Ports

and Peripherals for details.

Table 13. EXT Register Assignments Banks 0–4

Bank0

Bank1

Bank2

Bank3

Bank4

EXT0

User

EXT1

User

EXT2

User

EXT3

SPI Data

User

SPI Data

User

EXT4

Port0 Data

User

EXT5

Port2–Port1 Data

Port3 Data

User

EXT6

A/D_Ch0 Data

A/D_Ch1 Data

A/D_Ch2 Data

A/D_Ch3 Data

User

EXT7

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Table 14. EXT Register Assignments Banks 5–15

Bank5

Bank6–12

Bank13

Bank14

Bank15

EXT0

A/D_Ch1 Data

not deﬁned

A/D Control

C/T2 Load/Read

Port0 Control

EXT1

A/D_Ch2 Data

not deﬁned

C/T0 Control

C/T1 Control

Port1 Ctrl/Port0 Alloc

EXT2

A/D_Ch3 Data

not deﬁned

C/T0 Load

C/T1 Load

Ports 2, 3, & C/T2

Control

EXT3

SPI Data

not deﬁned

C/T0 Counter

C/T1 Counter

Wait State Control

EXT4

Port0 Data

not deﬁned

C/T0 Prescaler Ld C/T1 Prescaler Ld SPI Control

EXT5

Port2–Port1 Data

not deﬁned

C/T0 Prescaler

C/T1 Prescaler

System Clock Control

EXT6

A/D_Ch0 Data

Interrupt Polarity

Interrupt Allocation

EXT7

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Interrupt status/

Bank Select

Z8932320FSC Datasheet(PDF) 29 Page - Zilog, Inc.

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