System Overview
3-22
Am186™CC/CH/CU Microcontrollers User’s Manual
[TMRIN0]
[TMRIN1]
PIO27
PIO0
STI
STI
Timer Inputs 0–1 supply a clock or control signal to the internal
microcontroller timers. After internally synchronizing a Low-to-
High transition on [TMRIN1]–[TMRIN0], the microcontroller
increments the timer. [TMRIN1]–[TMRIN0] must be tied High if
not being used. When PIO is enabled for one or both, the pin is
pulled High internally.
[TMRIN1]–[TMRIN0] are driven internally by [INT8]/[PWD] when
pulse-width demodulation functionality is enabled. The
[TMRIN1]–[TMRIN0] pins can be used as PIOs when pulse-
width demodulation is enabled.
[TMROUT0]
[TMROUT1]
PIO28
PIO1
O
O
Timer Outputs 0–1 supply the system with either a single pulse
or a continuous waveform with a programmable duty cycle.
[TMROUT1]–[TMROUT0] are three-stated during bus-hold or
reset conditions.
ASYNCHRONOUS SERIAL PORTS (UART AND HIGH-SPEED UART)
UART
[RXD_U]
DCE_RXD_D
[PCM_RXD_D]
PIO26
STI
Receive Data UART is the asynchronous serial receive data
signal that supplies data from the asynchronous serial port to
the microcontroller.
[TXD_U]
[DCE_TXD_D]
[PCM_TXD_D]
PIO20
O
Transmit Data UART is the asynchronous serial transmit data
signal that supplies data to the asynchronous serial port from
the microcontroller.
[CTS_U]
[DCE_TCLK_D]
[PCM_FSC_D]
PIO24
STI
Clear-To-Send UART provides the Clear-to-Send signal from
the asynchronous serial port when hardware flow control is
enabled for the port. The [CTS_U] signal gates the transmission
of data from the serial port transmit shift register. When [CTS_U]
is asserted, the transmitter begins transmission of a frame of
data, if any is available. If [CTS_U] is deasserted, the transmitter
holds the data in the serial port transmit shift register. The value
of [CTS_U] is checked only at the beginning of the transmission
of the frame. [CTS_U] and [RTR_U] form the hardware
handshaking interface for the UART.
[RTR_U]
DCE_RCLK_D
[PCM_CLK_D]
PIO25
O
Ready-To-Receive UART provides the Ready-to-Receive
signal for the asynchronous serial port when hardware flow
control is enabled for the port. The [RTR_U] signal is asserted
when the associated serial port receive data register does not
contain valid, unread data. [CTS_U] and [RTR_U] form the
hardware handshaking interface for the UART.
HIGH-SPEED UART
[RXD_HU]
PIO16
STI
Receive Data High-Speed UART is the asynchronous serial
receive data signal that supplies data from the high-speed serial
port to the microcontroller.
TXD_HU
—
O
Transmit Data High-Speed UART is the asynchronous serial
transmit data signal that supplies data to the high-speed serial
port from the microcontroller.
Table 3-7
Signal Descriptions (Continued)
Signal Name
1
Multiplexed
Signal(s)
Type Description
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...