Asynchronous Serial Ports (UARTs)
Am186™CC/CH/CU Microcontrollers User’s Manual
13-3
13.3
SYSTEM DESIGN
Table 13-1 lists the UART 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.
.
13.4
REGISTERS
The registers listed in Table 13-2 program the UARTs: 8 for the UART and 15 for the High-
Speed UART. Appendix A summarizes the bits in all the registers. For a complete description
of all the peripheral registers, see the
Am186™CC/CH/CU Microcontrollers Register Set
Manual, order #21916.
In addition to these registers, the ITF4 bit field in the System Configuration (SYSCON)
register of the Am186CC microcontroller configures external interface 4 for the HDLC or
the UARTs.
In the Am186CH and Am186CU microcontrollers, the ITF4 bit field should be set to 10b.
Table 13-1
UARTs Multiplexed Signals
Signal Function
Multiplexed
Signal(s)
Default
Signal
UART
RXD_U
Receive data UART
DCE_RXD_D
PCM_RXD_D
PIO26
PIO26
TXD_U
Transmit data UART
DCE_TXD_D
PCM_TXD_D
PIO20
PIO20
CTS_U
Clear-to-send UART
DCE_TCLK_D
PCM_FSC_D
PIO24
PIO24
RTR_U
Read-to-receive UART
DCE_RCLK_D
PCM_CLK_D
PIO25
PIO25
High-Speed UART
RXD_HU
Receive data High-Speed UART
PIO16
PIO16
TXD_HU
Transmit data High-Speed UART
—
TXD_HU
CTS_HU
Clear-to-send High-Speed UART
DCE_CTS_D
PCM_TSC_D
PIO46
PIO46
RTR_HU
Read-to-receive High-Speed UART
DCE_RTR_D
PIO47
PIO47
CC
CH
CU
Содержание Am186 CC
Страница 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Страница 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Страница 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Страница 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Страница 39: ...Architectural Overview Am186 CC CH CU Microcontrollers User s Manual 1 15 Figure 1 6 32 Channel Linecard CH CC...
Страница 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Страница 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Страница 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Страница 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Страница 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...