MC68HC812A4 Datasheet, PDF (316/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

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R/W — Read/Write Flag
1 = Read
0 = Write
TTAGO — Trace, Tag, and Go Field
Table 17-4. TTAGO Decoding
TTAGO Value
00
01
10
11
Instruction
—
GO
TRACE1
TAGGO
REGN — Register/Next Field
Indicates which register is being affected by a command. In the case
of a READ_NEXT or WRITE_NEXT command, index register X is
pre-incremented by 2 and the word pointed to by X is then read or
written.
Table 17-5. REGN Decoding
REGN Value
000
001
010
011
100
101
110
111
Instruction
—
—
READ/WRITE NEXT
PC
D
X
Y
SP
MC68HC812A4 — Rev. 3.0
316
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