Section 10 Port Output Enable (POE)
Rev. 3.00 Sep. 27, 2007 Page 385 of 758
REJ09B0243-0300
10.3.1
Input Level Control/Status Register 1 (ICSR1)
ICSR1 is a 16-bit readable/writable register that selects the
POE0
,
POE1
, and
POE3
pin input
modes, controls the enable/disable of interrupts, and indicates status.
Bit:
Initial value:
R/W:
-
-
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/(W)
*
1
R/(W)
*
1
R/(W)
*
1
R/(W)
*
1
R
R
R
R/W
R/W
*
2
R/W
*
2
R/W
*
2
R/W
*
2
R/W
*
2
R/W
*
2
R/W
*
2
R/W
*
2
Notes:
Writing 0 to this bit after reading it as 1 clears the flag and is the only allowed way.
Can be modified only once after a power-on reset.
1.
2.
POE3F
-
POE1F POE0F
-
-
-
PIE1
POE3M[1:0]
POE1M[1:0]
POE0M[1:0]
Bit Bit
Name
Initial
value R/W Description
15 POE3F 0 R/(W)
*
1
POE3 Flag
(Supported only by the SH7125.)
This flag indicates that a high impedance request has
been input to the
POE3
pin.
[Clearing conditions]
•
By writing 0 to POE3F after reading POE3F = 1
(when the falling edge is selected by bits 7 and 6 in
ICSR1)
•
By writing 0 to POE3F after reading POE3F = 1 after
a high level input to POE3 is sampled at P
φ
/8, P
φ
/16,
or P
φ
/128 clock (when low-level sampling is selected
by bits 7 and 6 in ICSR1)
[Setting condition]
•
When the input set by ICSR1 bits 7 and 6 occurs at
the
POE3
pin
14
0
R/(W)
*
1
Reserved
This bit is always read as 0. The write value should
always be 0.
Содержание SH7124 R5F7124
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