Input Level Select Register - Fujitsu MB90390 Series Hardware Manual

CHAPTER 10 I/O PORTS
10.2.4

Input Level Select Register

The Input Level Select Register allows to switch from Automotive Hysteresis input
levels to CMOS Hysteresis input levels.
■ Input Level Select Register
The input level select register (ILSR) is located on addresses "0E
Address: 15
bit
00000F
ILSPB ILI2C
H
00000E
H
R/W
Initial value: 0
[bit15] ILSPB
If the ILSPB bit is set to "0", the input level of P44 will be selected by IL4 (bit4 of ILSR). If the ILSPB
bit is set to "1", the input level of P44 will be the opposite of the one selected by the IL4 bit. The initial
value of this bit is "0".
The initial value of this register is "0000
Hysteresis" after reset.
[bit14] ILI2C
If the ILI2C bit is set to "0", the input level of P42/SDA and P43/SCL will be selected by IL4 (bit4 of
ILSR). If the ILI2C bit is set to "1", the input level of P42/SDA and P43/SCL will be the opposite of the
one selected by the IL4 bit. The initial value of this bit is "0".
[bit13] ILRX0
If the ILRX0 bit is set to "0", the input level of P30/RX0 will be selected by IL3 (bit3 of ILSR). If the
ILRX0 bit is set to "1", the input level of P30/RX0 will be the opposite of the one selected by the IL3
bit. The initial value of this bit is "0".
[bit12] ILRX1
If the ILRX1 bit is set to "0", the input level of P21/RX1 will be selected by IL2 (bit2 of ILSR). If the
ILRX1 bit is set to "1", the input level of P21/RX1 will be the opposite of the one selected by the IL2
bit. The initial value of this bit is "0".
[bit11 to bit0] ILB to IL0
These bits set the input level of the corresponding port. IL0 sets the input level of Port0, ILB sets the
input level of PortB. Setting these bits to "0" selects the "Automotive Hysteresis" input level, setting
these bits to "1" selects the "CMOS Hysteresis" input level. The initial value of these bits is "0".
176
Figure 10.2-5 Input Level Select Register (ILSR)
14 13 12 11 10
ILRX0 ILRX1 ILB ILA
R/W R/W R/W R/W R/W
0 0 0 0 0
9 8 7 6 5
IL9 IL8 IL7 IL6 IL5
R/W R/W R/W R/W R/W
0 0 0
0 0
", so the input levels for all ports will be "Automotive
H
" and "0F ".
H H
4 3 2 1 0
IL4 IL3 IL2 IL1 IL0
R/W R/W R/W R/W R/W
0 0 0 0 0
ILSR