CC2640R2F: DIO status if there is no image

Albin Zhang

Expert 6140 points

Part Number: CC2640R2F

Hi,

What's the status of the DIO after power up if there is no code running?

What's the reset value of IOCFGx?

there is "6000h" in the 11.11.3.5 IOCFG4 Register (Offset = 10h) [reset = 6000h]

but, in the table, only bellow bit reset value is 3h, others are 0h.

14-13 PULL_CTL R/W 3h Pull control
1h = DWN : Pull down
2h = UP : Pull up
3h = DIS : No pull

BR. Albin

over 8 years ago

0 R.M over 8 years ago

TI__Genius 9215 points

Hi Albin,

Default configuration for the DIOs can be found in the CC26xx TRM chapter 11.12.3 and are for most DIOs DIS : No pull (6000h). This means that bit 13 and 14 in the IOCFGx register is one (3h), PULL_CTL = DIS : No pull.

When there is no valid image in flash the device starts up a ROM-based bootloader. This bootloader configures some of the DIOs for a UART and SSIO interface (Input with pull-up) and waits to be accessed by an external device. Which DIOs depends on the package and can be seen in the table below.

Signal	Pin Config	VQFN48 7x7	VQFN32 5x5	VQFN32 4x4	DSBGA34 5x5
UART0 RX	Input with pull-up	DIO2	DIO1	DIO1	DIO1
UART0 TX	No pull (output when selected)	DIO3	DIO0	DIO2	DIO0
SSI0 Clk	Input with pull-up	DIO10	DIO10	DIO8	DIO10
SSI0 Fss	Input with pull-up	DIO11	DIO9	DIO7	DIO9
SSI0 RX	Input with pull-up	DIO9	DIO11	DIO9	DIO11
SSI0 TX	No pull (output when selected)	DIO8	DIO12	DIO0	DIO12