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ZGP323H Datasheet(PDF) 37 Page - Zilog, Inc.

Part No. ZGP323H
Description  Programmable input glitch filter for pulse reception
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Maker  ZILOG [Zilog, Inc.]
Homepage  http://www.zilog.com
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ZGP323H Datasheet(HTML) 37 Page - Zilog, Inc.

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ZGP323H
Product Specification
PS023803-0305
Functional Description
29
The upper nibble of the register pointer (see Figure 16) selects which working reg-
ister 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 Z8 GP
family, banks 0, F, and D are implemented. A 0H in the lower nibble allows the nor-
mal 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 16. Register Pointer
Example: Z8 GP: (See Figure 15 on page 28)
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 = Reserved
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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