Technical data

ACCU contents before reading:
Result •• If the OB reads from the page successfully,
-
ACCU 1: (right-justified) contains the value
read (the remaining bits up to
maximum 32 are cleared),
-
ACCU 3: remains unchanged,
-
ACCU-2-L: contains a value incremented by 1,
2 or 4 (depending on the length
of the data transferred),
-
RLO: = 1,
- the remaining bit and
word condition codes:
are cleared.
High byte Low byte Low byteHigh byte
High word Low word
xx xx
Length ID Page number
0 to 255
xx
Address (relative to start of page)
x
x
31 2324 16
data (8 bits)
data (16 bits)
data (32 bit)
x
x
0 + 1... 2047 + 1 for length ID 0 (byte)
0 + 2 ... 2046 + 2 for length ID 1 (word)
0 + 4 ... 2044 + 4 for length ID 2 (double word)
0: byte (8 bits)
1: word (16 bits)
2: double word (32 bits)
87 0
15
ACCU 4
ACCU 3
ACCU 2
ACCU 1
Fig. 6-14 ACCU contents before calling OB 217
6
OB 216 to OB 218: Page Access
CPU 928B Programming Guide
C79000-B8576-C898-01
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