W83627DHG Datasheet, PDF (155/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
11.2.7 Interrupt Control Register (ICR) (Read/Write)
This 8-bit register enables and disables the five types of controller interrupts separately. A selected
interrupt can be enabled by setting the appropriate bit to logical 1. The interrupt system can be totally
disabled by setting bits 0 through 3 to logical 0.
7 65 4 3 2 1 0
0 0 00
RBR data ready interrupt enable (ERDRI)
TBR empty interrupt enable (ETBREI)
UART receive status interrupt enable (EUSRI)
Handshake status interrupt enable (EHSRI)
Bit 7-4: These four bits are always logical 0.
Bit 3: EHSRI. Set this bit to logical 1 to enable the handshake status register interrupt.
Bit 2: EUSRI. Set this bit to logical 1 to enable the UART status register interrupt.
Bit 1: ETBREI. Set this bit to logical 1 to enable the TBR empty interrupt.
Bit 0: ERDRI. Set this bit to logic 1 to enable the RBR data ready interrupt.
11.2.8 Programmable Baud Generator (BLL/BHL) (Read/Write)
Two 8-bit registers, BLL and BHL, compose a programmable baud generator that uses 24 MHz to
generate a 1.8461 MHz frequency and divide it by a divisor from 1 to (2¹⁶ –1). The output frequency of
the baud generator is the baud rate multiplied by 16, and this is the base frequency for the transmitter
and receiver. The table below illustrates the use of the baud generator with a frequency of 1.8461
MHz. In high-speed UART mode (CR0C, bits 7 and 6), the programmable baud generator directly uses
24 MHz and the same divisor as the normal speed divisor. As a result, in high-speed mode, the data
transmission rate can be as high as 1.5M bps.
PRE-DIV: 13
1.8461M HZ
50
75
110
134.5
150
300
600
1200
1800
2000
BAUD RATE FROM DIFFERENT PRE-DIVIDER
PRE-DIV:1.625 PRE-DIV: 1.0
14.769M HZ
24M HZ
DECIMAL DIVISOR
USED TO
GENERATE 16X
CLOCK
ERROR PERCENTAGE
400
650
2304
**
600
975
1536
**
880
1430
1047
0.18%
1076
1478.5
857
0.099%
1200
1950
768
**
2400
3900
384
**
4800
7800
192
**
9600
15600
96
**
14400
23400
64
**
16000
26000
58
0.53%
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Publication Release Date: Aug, 22, 2007
Version 1.4