High-Level Data Link Control (HDLC)
15-20
Am186™CC/CH/CU Microcontrollers User’s Manual
15.5.7
Interrupts
All interrupts are individually maskable. Set the status bits in the HxISTAT0 and HxISTAT1
registers. Mask interrupts in the HxIMSK0 and HxIMSK1 registers.
15.5.7.1
Transmit Interrupts
The microcontroller provides the following transmit interrupts:
■
Transmit threshold reached
■
Data byte available
■
Abort sent
■
Lost CTS
■
Transmit FIFO underflow
■
Good frame transmitted
■
Transmitter stopped
15.5.7.2
Receive Interrupts
The microcontroller provides the following receive interrupts:
■
Receive threshold reached
■
Receive status available
■
Data byte available
■
Short frame counter rollover
■
Mismatch address counter rollover
■
Receive FIFO overflow
■
Flag idle state entered
■
Mark idle state entered
■
Abort state entered
■
In-frame state entered
■
RTR deasserted
■
Short frame detected
■
Very short frame detected
15.5.8
Hardware-Related Considerations
■
The Receive Threshold (RTHRSH) bits in the HDLC Channel Receive Control 0
(HxRCON0) register specify the amount of data needed in the receive FIFO before giving
an interrupt. The possible values are: 1, 8, 16, or 32 bytes. The Receive FIFO Threshold
Reached (RTHRES) bit in the HxISTAT0 register can generate an interrupt if this
programmed threshold has been reached or exceeded in the receive FIFO and there
were no status bytes present in the FIFO at that time. When RTHRES is set by hardware,
the receiver reads the threshold value from the FIFO without rechecking the status. If a
status byte is put into the FIFO after the RTHRES bit is set, after the first read of the
FIFO the receiver clears the bit, even if there is still a threshold number of data bytes in
the receive FIFO. Therefore, when the RTHRES bit is set, the receiver can read the
threshold number of data bytes consecutively.
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...