ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 26

• Manufacturer Part Number: ez80190
• Description: Ez80190 Microprocessor
• Manufacturer: ZiLOG Semiconductor

PS006613-0306
Pin # Symbol
52
53
54
55
56
57
58
59
INSTRD
IORQ
RESET
ZCL
ZDA
PB0
PB1
PB2
Table 1. 100-Pin LQFP Pin Identification of the eZ80190 Device (Continued)
Function
Instruction
READ
Input/Output
Request
Reset
ZDI Clock
ZDI Data
GPIO Port B
GPIO Port B
GPIO Port B
Signal Direction
Output, Active
Low, tristate
Input/Output,
Active Low
Schmitt Trigger
Input, Active Low
Input with Pull-up
Input/Output,
Open-Drain with
Pull-up
Input/Output
Input/Output
Input/Output
PRELIMINARY
Description
INSTRD (with MREQ and RD) indicates the
eZ80190 device is fetching an instruction from
code memory. The eZ80190 device does not
drive this line during Reset or bus acknowledge
cycles.
IORQ indicates the CPU is accessing a location
in I/O space. RD and WR indicate the type of
access. The eZ80190 device does not drive this
line during Reset and is an input in bus
acknowledge cycles.
This signal is used to initialize the eZ80190
device. This input must be Low for a minimum of
3 system clock cycles, and must be held Low until
the clock is stable. This input includes a Schmitt
trigger to allow RC rise times.
The ZCL pin is used to clock the data between
the ZiLOG Debug Interface and the eZ80190
device. This pin features an internal pull-up.
The ZDA pin is used to transfer data between the
ZiLOG Debug Interface and the eZ80190 device.
This pin is open-drain and features an internal
pull-up.
The PB0 pin can be used for general-purpose I/O.
It can be individually programmed as an input or
output and can also be used individually as an
interrupt input. Each Port B pin, when
programmed as an output, can be selected to be
an open-drain or open-source output.
The PB1 pin can be used for general-purpose I/O.
It can be individually programmed as an input or
output and can also be used individually as an
interrupt input. Each Port B pin, when
programmed as an output, can be selected to be
an open-drain or open-source output.
The PB2 pin can be used for general-purpose I/O.
It can be individually programmed as an input or
output and can also be used individually as an
interrupt input. Each Port B pin, when
programmed as an output, can be selected to be
an open-drain or open-source output.
Architectural Overview
12