Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 78
![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
76543210
(by bit)
Port 6 Control and Mode Registers (P6 and P6M)
Port 6 is a general-purpose 8-bit, bidirectional I/O port, as shown in Table 32.
Each of the eight Port 6 I/O lines can be independently programmed as either
input or output using the Port 6 Mode Register (see Table 33.)
Table 32. P6 Register [Group/Bank 00h, Register 6 (R6)]
Table 33. P6M Register (Group/Bank 0Fh, Register 6)
A bit set to 1 in the P6M Register configures the corresponding bit in Port 6 as an
input, while a bit set to 0 configures an output line.
Timer Control Registers—General-Purpose Timer (T1)
The Z86D99/Z86L99 family provides one standard 8-bit Z8 counter/timer, T1,
driven by its own 6-bit prescaler, PRE1. T1 is independent of the processor
instruction sequence, relieving software from time-critical operations such as
interval timing or event counting. There are three registers that control the opera-
tion of T1: T1 Data Register (T1), T1 Mode Register (TMR), and T1 Prescale Reg-
ister (PRE1). Because the timer, prescaler, and mode register are mapped into
the standard Z8 register file, the software can treat the counter/timer as a general-
purpose register, thus eliminating the requirement for special instructions.
7
Port 6 Data
R/W
X
Bit/Field
Port 6 Data
7
P67M
R/W
1
Bit/Field
Port 6 Mode
Select
P
6
R/W
X
6
P66M
R/W
1
R
E
L
5
R/W
X
R/W
R/W
5
P65M
R/W
1
R/W
R/W
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
4
R/W
X
Value
Data
4
P64M
R/W
1
Value
1
0
I
Low-Voltage Microcontrollers with ADC
N
A
3
R/W
X
Description
Port 6 Input/Output Register
3
P63M
R/W
1
Description
Input
Output
R
Y
2
R/W
X
2
P62M
R/W
1
1
R/W
X
1
P61M
R/W
1
0
R/W
X
0
P60M
R/W
1
71
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