EZ80L92MCU Datasheet, PDF (228/241 Pages) Zilog, Inc. – eZ80Acclaim Flash Microcontrollers

eZ80L92 MCU
Product Specification
213
General Purpose I/O Port Input Sample Timing
Figure 55 illustrates timing of the GPIO input sampling. The input value on a GPIO port
pin is sampled on the rising edge of the system clock. The port value is then available to
the CPU on the second rising clock edge following the change of the port value.
System
Clock
GPIO Pin
Input Value
T_CLK
Port Value
Changes to 0
GPIO Input
Data Latch
GPIO Data
READ on Data Bus
0 Latched
Into GPIO
Data Register
Figure 55. Port Input Sample Timing
GPIO Data Register
Value 0 Read
by eZ80
General Purpose I/O Port Output Timing
Figure 56 and Table 133 provide timing information for GPIO port pins.
EXTAL
T_CLK
Port Output
T₁
T₂
Figure 56. GPIO Port Output Timing
PS013012-1004
PRELIMINARY
AC Characteristics