Z8927320VSC Datasheet, PDF (29/60 Pages) Zilog, Inc. – 16-BIT DIGITAL SIGNAL PROCESSORS WITH A/D CONVERTER

ZiLOG
Z89223/273/323/373
16-Bit Digital Signal Processors with A/D Converter
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.
EXT0
EXT1
EXT2
EXT3
EXT4
EXT5
EXT6
EXT7
Table 13. EXT Register Assignments Banks 0–4
Bank0
User
User
User
SPI Data
Port0 Data
Port2–Port1 Data
A/D_Ch0 Data
Interrupt status/
Bank Select
Bank1
User
User
User
User
Port0 Data
Port2–Port1 Data
A/D_Ch1 Data
Interrupt status/
Bank Select
Bank2
User
User
User
User
User
Port3 Data
A/D_Ch2 Data
Interrupt status/
Bank Select
Bank3
User
User
User
SPI Data
User
User
A/D_Ch3 Data
Interrupt status/
Bank Select
Bank4
User
User
User
User
User
User
User
Interrupt status/
Bank Select
EXT0
EXT1
EXT2
EXT3
EXT4
EXT5
EXT6
EXT7
Table 14. EXT Register Assignments Banks 5–15
Bank5
A/D_Ch1 Data
A/D_Ch2 Data
A/D_Ch3 Data
Bank6–12
not defined
not defined
not defined
SPI Data
Port0 Data
Port2–Port1 Data
A/D_Ch0 Data
Interrupt status/
Bank Select
not defined
not defined
not defined
A/D_Ch0 Data
Interrupt status/
Bank Select
Bank13
Bank14
Bank15
A/D Control
C/T2 Load/Read Port0 Control
C/T0 Control
C/T1 Control
Port1 Ctrl/Port0 Alloc
C/T0 Load
C/T1 Load
Ports 2, 3, & C/T2
Control
C/T0 Counter
C/T1 Counter
Wait State Control
C/T0 Prescaler Ld C/T1 Prescaler Ld SPI Control
C/T0 Prescaler C/T1 Prescaler System Clock Control
A/D_Ch0 Data Interrupt Polarity Interrupt Allocation
Interrupt status/ Interrupt status/ Interrupt status/
Bank Select
Bank Select
Bank Select
DS000202-DSP0599
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