F75113
7. Functional Description
Access Interface
The F75113 provides three auto-detected access interfaces, LPC, SMBus or SPI, to read/write internal registers.
In LPC interface, the default address of Configuration Register I/O port is 2Eh. When user writes data 10h to LPC
configuration register 27h, the address of Configuration Register I/O port will be 4Eh. In SMBus interface, Serial Bus
address default value is 6Eh (0110_1110). Another SPI interface only care the least eight bits (LSB) of 24 bits address.
SPI interface write register by 02h instruction (Page Program) and read register by 03h instruction (Read Data). Also
SPI interface supported byte write/read function.
Besides, the pin 46, 47, 48, 1, 2, 3, 4 are multi-function pins. If user want to access internal register by LPC
interface, the F75113 will only supported 39 GPIO function and the pin 4 won’t be used for GPIO function. If user wants
to access internal register by SMBus interface, the pin 48, 1, 2, 3 must be set internal pull-high with 10KΩ. When user
don’t use the pin 4 (GPIO function), the pin will must be set internal pull-high. In SPI interface, the pin 2, 3 must be set
internal pull-high with 10KΩ. Also, the pin 4 will be selectively set internal pull-high with 10KΩ by user.
GPIO Function
The F75113 with GPIO0X~GPIO4X General Purpose I/O port is composed of independent I/O pins controlled and
controls multi-pin function by Index 02~06h register. Each of GPIO group has input capability, output (push-pull and
open-drain) capability, internal pull-up resister with 10KΩ. Also F75113 has GPIO2x groups with the Low Level Input,
LED, SMI and RSTOUT function. Please check below table how to select the GPIO multi-function pin that user wants.
- 10 -
Dec,2011
V0.13P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
