z89138 ZiLOG Semiconductor, z89138 Datasheet - Page 29
z89138
Manufacturer Part Number
z89138
Description
Voice Processing Controllers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z89138.pdf
(66 pages)
- Current page: 29 of 66
- Download datasheet (325Kb)
Zilog
Port 5 (P53-P50). Port 5 is a 4-bit, bidirectional, CMOS
compatible I/O port (Figure 16). These four I/O lines are
configured under software control independently as inputs
or outputs. Port 5 is always available for I/O operation. The
input buffers are Schmitt-triggered. Bits programmed as
outputs can be globally programmed as either push-pull or
open-drain.
DS97TAD0201
Open-Drain
OEN
Out
In
1.5
Z89138/139
2.3V Hysteresis
MCU
Figure 16. Port 5 Configuration
R = 500 K
P R E L I M I N A R Y
Port 5 is a bit programmable general-purpose I/O port. The
control registers for Port 5 are mapped into the expanded
register file (Bank F) of the Z8.
Auto Latch. The Auto Latch on Port 5 puts valid CMOS
levels on all CMOS inputs which are not externally driven.
Whether this level is 0 or 1 cannot be determined. A valid
CMOS level, rather than a floating node, reduces exces-
sive supply current flow in the input buffer.
Port 5
(I/O)
Voice Processing Controllers
Auto Latch
Pad
Z89138/Z89139
29
1
Related parts for z89138
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Ez80f91 Mini Enet Module
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Development Boards & Kits - Other Processors ZiLOG TCP/IP Software Suite (ZTP Rev 1.4) - Object Code (Free download on www.zilog.com)
Manufacturer:
ZiLOG
Part Number:
Description:
Z90233, Z90234, And Z90231 Ezvision 200 Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Digital Television Controllers
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Television Controllers
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
40-pin Low-cost Digital Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
40-pin Low-cost Digital Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Digital Television Controller In-circuit Emulator Ice Device
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Digital Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Digital Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
High Performance Microcontrollers
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Cmos Usc Universal Serial Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Iusc Integrated Universal Serial Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
16-bit Processor
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Pcmcia Interface Solution
Manufacturer:
ZiLOG Semiconductor
Datasheet: