Programmable I/O Signals
9-2
Am186™CC/CH/CU Microcontrollers User’s Manual
Figure 9-1
PIO Operation Block Diagram
9.3
SYSTEM DESIGN
Table 9-1 lists the PIO signals that are multiplexed with other microcontroller functions.
Pinstraps are sampled only at external reset and do not affect the pin’s other functions, so
they are not shown in this table. Other multiplexed signals, when enabled, either disable or
alter any other functions that use the same pin. The table also shows which register bit
programs the pin to be the PIO or alternate function.
.
Alternate
Function
Data Out
Data
Out
PIO
Direction
Register
Write
Dir
D
Q
PIO
Mode
Register
Write
Mode
D
Q
PIO
Output
Write
Data
D
Q
PIO
Input
D
Q
S
R
Dir
Read Dir
PIO Data
Register
Write
Set
Write
Clear
Data
In
Read Mode
Read Set
Read Clear
Read Data
PIO
Bus
V
SS
or V
CC
1
100K
Alternate
Function
Data In
Pad
Notes:
1. Depends on pullup or pulldown.
2. When the PIO is enabled, an appropriate default value is driven on the Alternate Function Data In.
Mode
Default
Value
2
1
0
Summary of Contents for Am186 CC
Page 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Page 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Page 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Page 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Page 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Page 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Page 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Page 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Page 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...