Z51F3220FNX Datasheet, PDF (30/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
6.2 External Interrupt I/O Port
PULL-UP
REGISTER
OPEN DRAIN
REGISTER
DATA
REGISTER
SUB-FUNC DATA OUTPUT
SUB-FUNC ENABLE
SUB-FUNC DIRECTION
DIRECTION
REGISTER
0
MUX
1
1
MUX
0
Level Shift (1.8V to ExtVDD)
Level Shift (ExtVDD to 1.8V)
VDD
VDD
VDD
PAD
EXTERNAL
INTERRUPT
INTERRUPT
ENABLE
PORTx INPUT or
SUB-FUNC DATA INPUT
ANALOG CHANNEL
ENABLE
ANALOG INPUT
VDD
QD
CP
r
POLARITY
REG.
FLAG
CLEAR
0
MUX
1
QD
CP
r
DEBOUNCE
CLK
DEBOUNCE
ENABLE
CMOS or
Schmitt Level
Input
Figure 6.2 External Interrupt I/O Port
PS029902-0212
PRELIMINARY
27