● According to the operation unit [i], the data of the area specified by "[S]+2" (read pointer) are
set to [D].
● "[S]+2" (read pointer) is incremented (+1).
● After incrementing (+1), if "[S]+2" (read pointer) is [S] (buffer size), 0 is set to "[S]+2" (read
pointer).
● "[S]+1" (stored data amount) is decremented (-1).
■
Format of data buffer (FIFO buffer)
Buffer size
Stored data amount
Reading pointer
Writing pointer
・・・
Size of the data buffer area
・・・
Stored data amount (by operation unit)
・・・
Relative number from [S]+4
・・・
Relative number from [S]+4
Data buffer area
[S]
[S]+1
[S]+2
[S]+3
・
・
・
・
・
・・
・
■
Processing
1. Set the area specified by ([S]+2) (read pointer) to [D] (read data).
2. ([S]+2) (read pointer) is incremented (+1).
3. ([S]+1) (stored data amount) is decremented (-1).
H 105
K 5
K 1
H 101
H 103
K 4
K 4
H 102
H 104
K 5
K 0
H 101
H 103
DT0
DT1
DT2
DT3
DT4
DT5
DT6
DT7
Example) Operation unit: 16 bits (US, SS)
K 3
K 4
H 102
H 104
DT0
DT1
DT2
DT3
DT4
DT5
DT6
DT7
H 20
DT20
DT8
H 105
DT8
[S]…DT0
[D]…DT20
[S]
[S]+1
[S]+2
[S]+3
[S]+4
[S]+5
[S]+6
[S]+7
[S]+8
H 101
DT20
[S]
[S]+1
[S]+2
[S]+3
[S]+4
[S]+5
[S]+6
[S]+7
[S]+8
①
Because [S]+2 (reading pointer) points at 0,
transfer 0th data in the buffer to D.
③
Decrement (-1)
②
Increment (+1)
(Buffer size)
(Stored data amount)
(0th)
(1st)
(2nd)
(3rd)
(4th)
(Buffer size)
(Stored data amount)
(Writing pointer)
(0th)
(1st)
(2nd)
(3rd)
(4th)
(Reading pointer)
(Writing pointer)
(Reading pointer)
[i]…US,SS
■
Flag operations
Name
Description
SR7
SR8
(ER)
To be set in the case of out-of-range in indirect access (index modification).
To be set when [S] (buffer size) is larger than 4096, or [S] (buffer size) is 0.
To be set when "[S]+1" (stored data amount) is 0.
8.18 FIFR (Data Read (First-In-First-Out))
8-38
WUME-FP7CPUPGR-12
Summary of Contents for FP7 Series
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Page 129: ...3 11 PSHS Push stack RDS Read stack POPS Pop stack WUME FP7CPUPGR 12 3 25 ...
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