Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 75
Z86D99
Manufacturer Part Number
Z86D99
Description
Low-Voltage Micro controllers with ADC
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z86D99.pdf
(102 pages)
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PS003807-1002
Bit
Bit/Field
R/W
Reset
R = Read, W = Write, X = Indeterminate
Bit
Position
7654321_
_________0 Port 2 Output
Bit
Bit/Field
R/W
Reset
R = Read, W = Write, X = Indeterminate
Bit
Position
76543210
Bit
Bit/Field
R/W
Reset
R = Read, W = Write, X = Indeterminate
Bit
Position
76543210
(by bit)
Table 25. P3M Register [Group/Bank F0h, Register 7 (R247)]
Port 2 Control and Mode Registers (P2 and P2M)
Port 2 is a general-purpose 8-bit, bidirectional I/O port, as shown in Table 26.
Each of the eight Port 2 I/O lines can be independently programmed as either
input or output using the Port 2 Mode Register (see Table 27.)
Table 26. P2 Register [Group/Bank 00h, Register 2 (R2)]
Table 27. P2M Register [Group/Bank F0h, Register 6 (R246)]
7
Reserved
W
1
Bit/Field
Reserved
Configuration
7
Port 2 Data
R/W
X
Bit/Field
Port 2 Data
7
P27M
W
1
Bit/Field
Port 2 Mode
Select
P
6
W
1
6
R/W
X
6
P26M
W
1
R
E
L
5
W
1
R/W
R
W
W
5
R/W
X
R/W
R/W
5
P25M
W
1
R/W
R
W
W
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
4
W
1
Value
1
X
1
0
4
R/W
X
Value
Data
4
P24M
W
1
Value
1
1
0
I
Low-Voltage Microcontrollers with ADC
N
A
3
W
1
Description
Always reads 1111111
No Effect
Push-Pull Active
Open Drain Outputs
3
R/W
X
Description
Port 2 Input/Output Register
3
P23M
W
1
Description
Always reads 11111111
Input
Output
R
Y
2
W
1
2
R/W
X
2
P22M
W
1
1
W
1
1
R/W
X
1
P21M
W
1
0
P2_
Output
W
1
0
R/W
X
0
P20M
W
1
68
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