F81218 Datasheet, PDF (25/64 Pages) Feature Integration Technology Inc. – ISA/LPC to 6 UART Datasheet

F81218
6. Register Description
Registers are programmed by port 0x4E and 0x4F. 0x4E is the index port and 0x4F is the data port .
To enable configuration registers programming, entry key must output twice to index port
continuously. The entry key is decided by power on setting pins RTS2#/PS_CONF_KEY1 and
RTS3#/PS_CONF_KEY0 as following:
RTS2#/PS_CONF_KEY1
0
0
1
1
RTS3#/PS_CONF_KEY0
0
1
0
1
Entry key
0x77 ( default )
0xA0
0x87
0x67
To exit configuration registers programming, output 0xAA to index port.
Sample code for configuration:
1. Clock in used 48MHz, UART 1~6 address (0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x3e0, 0x2e0), IRQ(3,
4, 5 ,9 , 10 , 11, Entry key is 0x77:
outportb(0x4e, 0x77);
outportb(0x4e, 0x77); //Entry configuration mode
outportb(0x4e, 0x25); //Select register index 0x25
outportb(0x4f, 0x01); //Set bit 0 to 1 select clock input to 48MHz
outportb(0x4e, 0x07); //Select register index 0x07
outportb(0x4f, 0x00); //Select LDN 0
outportb(0x4e, 0x60); //Select LDN 0 register index 0x60
outportb(0x4f, 0x03); //Set UART 1 base address high byte to 0x03
outportb(0x4e, 0x61); //Select LDN 0 register index 0x61
outportb(0x4f, 0xf8); //Set UART 1 base address low byte to 0xf8
outportb(0x4e, 0x70); //Select LDN 0 register index 0x70
outportb(0x4f, 0x03); //Set UART 1 interrupt channel to IRQ 3
outportb(0x4e, 0x30); //Select LDN 0 register index 0x30
outportb(0x4f, 0x01); //Enable UART 1
outportb(0x4e, 0x07); //Select register index 0x07
outportb(0x4f, 0x01); //Select LDN 1
outportb(0x4e, 0x60); //Select LDN 1 register index 0x60
-20-
August, 2007
V0.33P