Zilog Z16C30 Bedienungsanleitung PDF herunterladen (Seite 36)

2-10

Z16C30 USC

USER'S MANUAL

UM97USC0100

ZILOG

2.9.5 About the Register Address Tables

Tables 2-1 and 2-2 show the names and addresses of the

addressable registers in the USC, in address and alpha-

betical order. The Tables assume that SRightA (BCR0) is

1. The RegAddr column in the Tables reflects the state of

AD5-AD1, AD13-AD9, or CCAR5-1 as applicable.

If “16-bit” (BCR2) is 1, the B//W bit from AD6, AD14, or

CCAR6 selects between a 16-bit transfer (if 0/low) and an

8-bit transfer (if 1). If “16-bit” is 0, the USC ignores AD6,

AD14, or CCAR6 (as applicable). Note that the values in

the “8-bit data” columns of Tables 2-1 and 2-2 include the

B//W bit 1 for both direct and indirect addressing, as is

required on a 16-bit bus. When 16-bit (BCR2) is 0 these

address values can be used as shown, or 64 lower like the

addresses shown in the “16-bit data” columns.

For 8-bit transfers on either an 8- or 16-bit bus, the state of

AD0, AD8, or CCAR0 selects the less-significant 8 bits of

the register (if 0/low) or the more-significant 8 bits if 1/high.

In this regard the USC is “little Endian” like Intel micropro-

cessors. For 16-bit transfers, AD0, AD8, or CCAR0 must be

0/low.

RegAddrRTMode

Chan

Load

U//LRTCmd B//W

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

Reset

Figure 2-8. The Channel Command/Address Register (CCAR)

The Direct Address columns of the Tables assume:

(1) SRightA (BCR0) is 1,

(2) the processor’s multiplexed AD6-AD0 lines are con-

nected to AD6-AD0, or its A5-A0 lines are connected

to AD13-AD8, depending on SepAd (BCR15),

(3) the D//C pin is grounded, and

(4) the processor’s A7 line is connected to A//B.

If your design differs from these assumptions, register

addressing will be different from that shown in the Direct

Address columns.

UM009402-0201

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 207 208

Kommentare zu diesen Handbüchern

Keine Kommentare

Zilog Z16C30 Bedienungsanleitung Seite 36

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Sensoren Zilog Z16C30