Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 76
![no-image](/images/no-image-200.jpg)
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
76543210
Bit
Bit/Field
R/W
Reset
R = Read, W = Write, X = Indeterminate
Bit
Position
7654_210
(by bit)
____3___
Note:
A bit set to 1 in the P2M Register configures the corresponding bit in Port 2 as an
input, while a bit set to 0 configures an output line.
Port 4 Control and Mode Registers (P4 and P4M)
Port 4 is a general-purpose 8-bit, bidirectional I/O port, as shown in Table 28.
Each of the eight Port 4 I/O lines can be independently programmed as either
input or output using the Port 4 Mode Register (see Table 29.)
Table 28. P4 Register [Group/Bank 00h, Register 4 (R4)]
.
Table 29. P4M Register (Group/Bank 0Fh, Register 2)
A bit set to 1 in the P4M Register configures the corresponding bit in Port 4 as an
input, while a bit set to 0 configures an output line.
P43, the controlled current output pad, cannot be configured as
an input. (P43 read = P43 out)
7
Port 4 Data
R/W
X
Bit/Field
Port 4 Data
7
P47M
R/W
1
Bit/Field
Port 4 Mode
Select
P43
Mode Select
P
6
R/W
X
6
P46M
R/W
1
R
E
L
5
R/W
X
R/W
R/W
5
P45M
R/W
1
R/W
R/W
R/W
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
4
R/W
X
Value
Data
4
P44M
R/W
1
Value
1
0
0
1
I
Low-Voltage Microcontrollers with ADC
N
A
3
R/W
X
Description
Port 4 Input/Output Register
3
P43M
R/W
1
Description
Input
Output
Output
Tristate High Impedance (available
on Z86L990/L991 only)
R
Y
2
R/W
X
2
P42M
R/W
1
1
R/W
X
1
P41M
R/W
1
0
R/W
X
0
P40M
R/W
1
69
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