User’s Manual S19262EJ3V0UM
7
CONTENTS
CHAPTER 1 OVERVIEW..........................................................................................................................10
1.1
Function Overview ....................................................................................................................10
1.2
Features .....................................................................................................................................10
1.3
I/O Signals..................................................................................................................................10
CHAPTER 2 PIN FUNCTIONS ................................................................................................................11
2.1
UART Interface Pins .................................................................................................................11
CHAPTER 3 REGISTERS ........................................................................................................................12
3.1
Registers....................................................................................................................................12
3.2
UART Registers.........................................................................................................................13
3.2.1
Receive buffer/transmit hold register ............................................................................................ 13
3.2.2
Interrupt enable register ................................................................................................................ 15
3.2.3
Interrupt identification register....................................................................................................... 16
3.2.4
FIFO control register ..................................................................................................................... 18
3.2.5
Line control register ...................................................................................................................... 21
3.2.6
Modem control register ................................................................................................................. 23
3.2.7
Line status register........................................................................................................................ 25
3.2.8
Modem status register .................................................................................................................. 27
3.2.9
Scratch register............................................................................................................................. 28
3.2.10
Divisor latch LS byte register ........................................................................................................ 28
3.2.11
Divisor latch MS byte register ....................................................................................................... 29
3.2.12
Hardware control register.............................................................................................................. 30
3.2.13
Hardware status register 2 ............................................................................................................ 31
3.2.14
Hardware status register 3 ............................................................................................................ 32
3.3
IR Encoder/Decoder Registers ................................................................................................33
3.3.1
IR control register 0....................................................................................................................... 33
3.3.2
IR control register 1....................................................................................................................... 34
3.3.3
IR control register 2....................................................................................................................... 35
3.3.4
IR control register 3....................................................................................................................... 35
3.3.5
IR control register 4....................................................................................................................... 36
CHAPTER 4 DESCRIPTION OF FUNCTIONS ......................................................................................37
4.1
Auto-Flow Mode ........................................................................................................................37
4.2
FIFOs ..........................................................................................................................................38
4.2.1
Operation in FIFO interrupt mode ................................................................................................. 38
4.2.2
Operation in FIFO polled mode..................................................................................................... 38
4.2.3
Read when the receive FIFO is empty ..........................................................................................38
4.3
Interrupt Sources ......................................................................................................................39
4.4
Clock and Reset ........................................................................................................................39
4.5
I/O Timing...................................................................................................................................39
4.5.1
Serial data..................................................................................................................................... 39
4.5.2
Timing of auto-flow CTS control.................................................................................................... 40
4.5.3
Timing of auto-flow RTS control.................................................................................................... 40
