EM346-RTR datasheet(54/142 Pages) SILABS

54 / 142 page

EM346

Rev 1.0

operation, but has other miscellaneous control bits as well. GPIO_DBGSTAT, a read-only register, returns status

related to debugger activity (GPIO_FORCEDBG and GPIO_SWEN), as well a flag (GPIO_BOOTMODE) indicating

whether nBOOTMODE was asserted at the last power-on or nRESET-based reset.

7.10. GPIO Signal Assignment Summary

The GPIO signal assignments are shown in Table 7.4.

Table 7.4. GPIO Signal Assignments

GPIO

Analog

Alternate Output

Input

Output Current

Drive

PA4

PTI_EN, TRACEDATA2

Standard

PA5

PTI_DATA, TRACEDATA3

nBOOTMODE1

Standard

PA7

REG_EN2

High

PB0

TRACECLK

IRQA

Standard

PB1

SC1TXD, SC1MOSI, SC1MISO,

SC1SDA

Standard

PB2

SC1SCLK

SC1MISO, SC1MOSI, SC1SCL,

SC1RXD

Standard

PB3

SC1SCLK

SC1SCLK, SC1nCTS

Standard

PB4

SC1nRTS

SC1nSSEL

Standard

PC0

TRACEDATA1

JRST3

High

PC1

TRACEDATA0, SWO

Standard

PC2

JTDO4, SWO

Standard

PC3

JTDI3

Standard

PC4

SWDIO5

SWDIO5, JTMS5

Standard

PC5

TX_ACTIVE

Standard

PC6

OSC32B

nTX_ACTIVE

Standard

PC7

OSC32A

Standard

Notes:

1. Overrides during reset as an input with pull up.

2. Overrides after reset as an open-drain output.

3. Overrides in JTAG mode as a input with pull up.

4. Overrides in JTAG mode as a push-pull output.

5. Overrides in Serial Wire mode as either a push-pull output, or a floating input, controlled by the debugger.

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