z893232yfsc ZiLOG Semiconductor, z893232yfsc Datasheet - Page 29

• Manufacturer Part Number: z893232yfsc
• Description: 16-bit Digital Signal Processors
• Manufacturer: ZiLOG Semiconductor

16-bit Programmable I/O (Port 0)
When the appropriate bit is set in the Port 1 control register,
Port 0 acts as a 16-bit programmable, bidirectional, CMOS-
compatible port. Each of the 16 lines can be independently
programmed as an input or an output, or globally as an
open-drain output. When enabled, Bank 0/Ext 4 acts as the
DS95DSP0101 Q4/95
Bank 15/Ext 0 Reg
D15 D14 D13 D12 D11 D10
Open-Drain
OEN
Out
In
Figure 20. Port 0, 1 and 2 Configuration
D9
Figure 19. Port 0 Control Register
P R E L I M I N A R Y
D8
D7
R
D6
500 kOhms
D5
data I/O register. Bank 15/Ext 0 serves as the Port 0
direction register while Bank 15/Ext 1, has specified bits to
enable Port 0 and determine whether Port 0 is globally
configured as open-drain outputs.
D4
D3
D2
D1
D0
Auto Latch
16-B
Port I/O Direction
0 = Output
1 = Input
IT
Pad
D
IGITAL
S
IGNAL
Z89323/373/393
P
ROCESSORS
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