z8e001 ZiLOG Semiconductor, z8e001 Datasheet - Page 34

• Manufacturer Part Number: z8e001
• Description: Feature-rich Z8plus One-time Programmable Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

Z8E001
Z8Plus OTP Microcontroller
PORT B
Port B Description
Port B is a 5-bit (bidirectional), CMOS-compatible I/O port.
These five I/O lines can be configured under software con-
trol to be an input or output, independently. Input buffers
are Schmitt-triggered. See Figure 33 through Figure 36 for
diagrams of all five Port B pins.
In addition to standard input/output capability on all five
pins of Port B, each pin provides special functionality as
shown in the following table:
Special functionality is invoked via the Port B Special Func-
tion Register. See Figure 32 for the arrangement and control
conventions of this register.
34
Register 0D7H
D7
D6
D5
D4
Figure 32. Port B Special Function Register
PTBSFR
D3
D2
P R E L I M I N A R Y
D1
Port Pin
PB0
PB1
PB2
PB3
PB4
D0
Table 8. Port B Special Functions
1 = ENABLE PB0 AS SMR INPUT
0 = NO SPECIAL FUNCTIONALITY
1 = ENABLE PB1 AS TIMER0 OUTPUT
0 = NO SPECIAL FUNCTIONALITY
Input Special
Function
Stop Mode Recovery
Input
None
IRQ3
Comparator Reference
Input
Comparator Signal
Input/IRQ1/IRQ4
1 = ENABLE PB2 AS IRQ3 INPUT
0 = NO SPECIAL FUNCTIONALITY
1 = Analog Comparator on PB3 & PB4
0 = Digital Inputs on PB3 & PB4
1 = PB4 Interrupts Enabled
0 = PB4 Interrupts Disabled
RESERVED (MUST BE 0)
DS001101-Z8X0400
Output Special
Function
None
Timer0 Output
None
None
None
ZiLOG