z8pe003 ZiLOG Semiconductor, z8pe003 Datasheet - Page 33

• Manufacturer Part Number: z8pe003
• Description: Feature-enhanced Z8plus 1k Rom One-time Programmable Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

ZiLOG
RESET CONDITIONS
After a
control, value, and auto-initialization register status after
RESET
I/O PORTS
The Z8Plus dedicates 14 lines to input and output. These lines
are grouped into two ports known as Port A and Port B. Port
A is an 8-bit port, bit programmable as either inputs or outputs.
Port B can be programmed to provide either standard in-
put/output, or the following special functions:
comparator input,
Directional Control and Special Function
Registers
Each port on the Z8Plus features a dedicated directional con-
trol register that determines (on a bit-wise basis) if a given
port bit operates as input or output.
Each port on the Z8Plus features a special function register
(
ister, implements (on a bit-by-bit basis) any special func-
tionality that can be defined for each particular port bit.
DS008700-Z8X0799
SFR
) that, in conjunction with the directional control reg-
RESET
.
PTAOUT Bit n
N = 0...7
PTASFR Bit n
N = 0...7
PTADIR Bit n
N = 0...7
PTAIN Bit n
N = 0...7
, the timers are disabled. See Table 8 for timer
Figure 26. Port A Configuration with Open-Drain Capability and Schmitt-Trigger
SMR
input, and external interrupt inputs.
T0
P R E L I M I N A R Y
output,
All pins except
addition, the outputs of Port A on a bit-wise basis can be
configured for open-drain operation.The ports operate on
a bit-wise basis. As such, the register values for/at a given
bit position only affect the bit in question.
Each port is defined by a set of four control registers (Figure 26).
Input and Output Value Registers
Each port features an Output Value Register and an input
value register. For port bits configured as an input by means
of the directional control register, the input value register
Register
Port B Special Function
Port B Directional Control
Port B Output Value
Port B Input Value
Port A Special Function
Port A Directional Control
Port A Output Value
Port A Input Value
Table 14. I/O Ports Registers
PB5
include push-pull CMOS outputs. In
Z8Plus OTP Microcontroller
Address
0D7H
0D6H
0D5H
0D4H
0D3H
0D2H
0D1H
0D0H
PA0–PA7
PIN
Identifier
PTBSFR
PTBDIR
PTBOUT
PTBIN
PTASFR
PTADIR
PTAOUT
PTAIN
Z8PE002
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