z893232yfsc ZiLOG Semiconductor, z893232yfsc Datasheet - Page 30

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

8-Bit Programmable I/O (Port 1)
When the appropriate bit is set in the Port 1 control register,
Port 1 acts as an 8-bit programmable, bi-directional,
CMOS-compatible port. Each of the eight lines can be
independently programmed as an input or an output or
30
Port.Bit
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
Bank 15/Ext 1 Reg
D15 D14 D13
IF (Condition Explanation)
Bank15/Ext1(3)=1 (Enable External Interrupt Source INT2)
Bank15/Ext1(5)=1 (CLKOUT Enable)
Bank15/Ext4(0)=1 (SPI Enable)
Bank15/Ext4(0)=1 (SPI Enable)
Bank15/Ext4(0)=1 (SPI Enable)
Bank15/Ext4(0)=1 (SPI Enable)
Bank13/Ext1(2-1)=10 or Bank14/Ext1(2-1)=10 (UI0 Enable)
Bank13/Ext1(2-1)=11 or Bank14/Ext1(2-1)=11 (UI0 Enable)
D12
D11
D10
D9
D8
Table 10. Port 1 Bit Function Selection
Figure 21. Bank15/EXT1 Register
D7
P R E L I M I N A R Y
D6
D5
D4
D3
globally as an open-drain output. When enabled,
Bank0/EXT5 (Least Significant Bit) acts as the data I/O
register. Bank15/EXT1 serves as the Port1 direction control
register. Port 1 can also be programmed to provide special
I/O functions.
D2
D1
D0
SIN
SOUT
S S
SK
Then
INT2
CLKOUT
UI0
UI1
Pins P0 15-0 Port Allocation
1 : Enable External Interrupt Source INT2
0 : Disable External Interrupt Source (default)
1 : Enable External Interrupt Source INT1
0 : Disable External Interrupt Source (default)
1 : CLKOUT Enabled (P11)
0 : CLKOUT Disabled (default)
1 : Port 1 Outputs Open-Drain
0 : Port 1 Outputs Push-Pull (default)
1 : Port 0 Outputs Open-Drain
0 : Port 0 Outputs Push-Pull (default)
Port 1 I/O Directions
000 : Ext 15-0 (default)
001 : P0 15-8 <= P1 7-0,
010 : Reserved
011 : P0 15-8 <= P0 15-8,
100 : P0 15-0
101 : P0 15-8 <= P1 7-0
110 : Reserved
111 : Reserved
1 : Output
0 : Input (default)
P0 7-0 <= Ext 7-0
P0 7-0 <= Ext 7-0
P0 7-0 <= P0 7-0
16-B
DS95DSP0101 Q4/95
IT
D
IGITAL
Else
P10
P11
P12
P13
P14
P15
P16
P17
S
IGNAL
Z89323/373/393
P
ROCESSORS