Z8FS021 Datasheet, PDF (16/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
8
Signal Descriptions
Table 2 describes the Z8FS021 MCU signals. Signal availability is package dependent.
See the Pin Configuration section on page 5 for signal availability multiplexing.
Table 2. Z8FS021 MCU Signal Descriptions
Signal
Mnemonic
I/O Description
General-Purpose I/O Ports A–D
PA[7:0]
PB[5:0]
PC[7:0]
PD[0]
I/O Port A. These pins are used for general-purpose I/O.
I/O Port B. These pins are used for general-purpose I/O.
I/O Port C. These pins are used for general-purpose I/O.
O Port D. This pin is used for general-purpose output only.
UART Controllers
TXD0
RXD0
CTS0
DE
O Transmit Data. This signal is the transmit output from the UART and IrDA.
I Receive Data. This signal is the receive input for the UART and IrDA.
I Clear To Send. This signal is the flow control input for the UART.
O Driver Enable. This signal allows automatic control of external RS-485
drivers. It is approximately the inverse of the Transmit Empty (TXE) bit in
the UART Status 0 Register. The DE signal can be used to ensure that the
external RS-485 driver is enabled when data is transmitted by the UART.
Timers
T0OUT/T1OUT
T0OUT/T1OUT
T0IN/T1IN
O Timer Output 0–1. These signals are outputs from the timers.
O Timer Complement Output 0–1. These signals are output from the timers in
PWM Dual Output mode.
I Timer Input 0–1. These signals are used as the capture, gating and counter
inputs.
Comparator
CINP/CINN
COUT
I Comparator Inputs. These signals are the positive and negative inputs to
the comparator.
O Comparator Output.
Analog
ANA[7:0]
V_REF
I Analog Port. These signals are used as inputs to the analog-to-digital
converter (ADC).
I/O Analog-to-digital converter reference voltage input, or buffered output for
internal reference.
PS028806-0315
Signal Descriptions