ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 149

• Manufacturer Part Number: ez80190
• Description: Ez80190 Microprocessor
• Manufacturer: ZiLOG Semiconductor

PS006613-0306
Bit
Reset
CPU Access
Note: R = Read; W = Write.
Bit
Position
[7:5]
4
BANK
[3:2]
CALC_STAT
[1:0]
DATA_STAT
Value Description
000
0
1
00
01
10
11
00
01
10
11
W
Table 73. MACC Status Register
7
0
Reserved.
The current DATA bank is Bank 0. The current DATA
bank is always reset to Bank 0 when both banks are
EMPTY.
The current CALC bank is Bank 1.
The CALC bank is EMPTY. No calculation is set up for
execution.
Invalid.
The CALC bank is IN PROGRESS. The MACC is currently
executing on a data set.
The CALC bank is DONE. The MACC has completed
execution of the operations defined by the CALC bank
control registers. The result is stored in the CALC bank
accumulator registers. The CALC bank must be swapped
with the DATA bank to allow the CPU to access the result.
The DATA bank is EMPTY. No calculation is set up for
execution.
The DATA bank is READY. The calculation is prepared
for execution.
Invalid.
The DATA bank is DONE. The DATA bank accumulator
registers contain the result from a recently completed
calculation. This result is not yet read by the CPU.
(MACC_STAT = EDh)
R
6
0
PRELIMINARY
R
5
0
R
4
0
R
3
0
eZ80190 Product Specification
R
2
0
R
1
0
Multiply-Accumulator
R
0
0
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