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ZLP32300 Datasheet(PDF) 27 Page - Zilog, Inc.

Part # ZLP32300
Description  Low power consumption??1 mW
PDF  99 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

ZLP32300 Datasheet(HTML) 27 Page - Zilog, Inc.

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Crimzon® ZLP32300
Product Specification
PS020823-0208
Functional Description
23
The upper nibble of the register pointer (see Figure 14) selects which working register
group, of 16 bytes in the register file, is accessed out of the possible 256. The lower nibble
selects the expanded register file bank and, in the case of the Crimzon ZLP32300 family,
banks 0, F, and D are implemented. A 0h in the lower nibble allows the normal register
file (bank 0) to be addressed. Any other value from 1h to Fh exchanges the lower 16
registers to an expanded register bank.
Figure 14. Register Pointer
Example: Crimzon ZLP32300 (see Figure 13 on page 22)
R253 RP = 00h
R0 = Port 0
R1 = Port 1
R2 = Port 2
R3 = Port 3
But if:
R253 RP = 0Dh
R0 = CTR0
R1 = CTR1
R2 = CTR2
R3 = CTR3
The counter/timers are mapped into ERF group D. Access is easily performed using the
following:
LD
RP, #0Dh
; Select ERF D
for access to bank D
; (working
register group 0)
LD
R0,#xx
; load CTR0
LD
1, #xx
; load CTR1
R253 RP
D7
D6
D5
D4
D3
D2
D1
D0
Expanded Register
File Pointer
Working Register
Pointer
Default Setting After Reset = 0000 0000



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