W83977F-A Datasheet, PDF (138/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
13.4 Logical Device 2 (UART A)¢)
CR30 (Default 0x01 when PNPCSV=0 at POR)
Bit 7-1 : Reserved.
Bit 0 :
= 1 Activates the logical device.
= 0 Logical device is inactive.
CR31
Bit 7-2 : Reserved.
Bit 1 : ENRNGCK -- > Enable I/O Range check
Bit 0 : FORIORD --> Forces LDN to respond I/O read
CR60, CR 61 (Default 0x03, 0xF8 when PNPCSV=0 at POR )
These two registers select Serial Port 1 I/O base address [0x100:0xFF8] on 8 byte boundaries.
CR70 (Default 0x04 when PNPCSV=0 at POR)
Bit 7-4 : Reserved.
Bit [3:0] : These bits select IRQ resource for Serial Port 1.
CR71(Default 0x02, read only)
Bit 7-2 : Reserved.
Bit 1 : IRQLEV -- > IRQ Level
= 1: High; = 0: Low
Bit 0 : IRQTYPE --> IRQ Type
= 1: Level trigger; = 0: Edge trigger
CRF0 (Default 0x00)
Bit 7-2 : Reserved.
Bit 1-0 : SUACLKB1, SUACLKB0
= 00 UART A clock source is 1.8462 Mhz (24MHz/13)
= 01 UART A clock source is 2 Mhz (24MHz/12)
= 10 UART A clock source is 24 Mhz (24MHz/1)
= 11 UART A clock source is 14.769 Mhz (24MHz/1.625)
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