REV. 5.0.3 2.9.1 Transmit Holding Register (THR) - Write Only The transmit holding register i" />
參數(shù)資料
型號： ST16C650AIQ48TR-F
廠商： Exar Corporation
文件頁數(shù)： 6/50頁
文件大?。?/td> 0K
描述： IC UART FIFO 32B 48TQFP
標準包裝： 1,500
特點： *
通道數(shù)： 1，UART
FIFO's： 32 字節(jié)
規(guī)程： 打印機，RS232，RS422，RS485
電源電壓： 2.9 V ~ 5.5 V
帶并行端口： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 帶卷 (TR)
ST16C650A
14
2.90V TO 5.5V UART WITH 32-BYTE FIFO
REV. 5.0.3
2.9.1
Transmit Holding Register (THR) - Write Only
The transmit holding register is an 8-bit register providing a data interface to the host processor. The host
writes transmit data byte to the THR to be converted into a serial data stream including a start bit, data bits,
parity bit and stop bit(s). The least-significant-bit (Bit-0) is the first data bit to go out. The THR is the input
register to the transmit FIFO of 32 bytes when FIFO operation is enabled by FCR bit-0. Every time a write
operation is made to the THR, the FIFO data pointer is automatically bumped to the next sequential data
location.
2.9.2
Transmitter Operation in non-FIFO Mode
The host loads transmit data to THR one character at a time. The THR empty flag (LSR bit-5) is set when the
data byte is transferred to TSR. THR flag can generate a transmit empty interrupt (ISR bit-1) when it is enabled
by IER bit-1. The TSR flag (LSR bit-6) is set when TSR becomes completely empty.
FIGURE 8. TRANSMITTER OPERATION IN NON-FIFO MODE
Transmit
Holding
Register
(THR)
Transmit Shift Register (TSR)
Data
Byte
L
S
B
M
S
B
THR Interrupt (ISR bit-1)
Enabled by IER bit-1
TXNOFIFO1
16X Clock
2.9.3
Transmitter Operation in FIFO Mode
The host may fill the transmit FIFO with up to 32 bytes of transmit data. The THR empty flag (LSR bit-5) is set
whenever the FIFO is empty. The THR empty flag can generate a transmit empty interrupt (ISR bit-1) when the
amount of data in the FIFO falls below its programmed trigger level. The transmit empty interrupt is enabled by
IER bit-1. The TSR flag (LSR bit-6) is set when TSR/FIFO becomes empty.
FIGURE 9. TRANSMITTER OPERATION IN FIFO AND FLOW CONTROL MODE
Transmit Data Shift Register
(TSR)
Transmit
Data Byte
THR Interrupt (ISR bit-1) falls
below the programmed Trigger
Level and then when becomes
empty. FIFO is Enabled by FCR
bit-0=1
Transmit
FIFO
16X Clock
Auto CTS Flow Control (CTS# pin)
Auto Software Flow Control
Flow Control Characters
(Xoff1/2 and Xon1/2 Reg.
TXF IF O 1
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