User Manual

12 MC13192 Product Preview MOTOROLA
Contact Connections
11 GPIO1 Digital Input/
Output
General Purpose Input/Output1.
When gpio_lt_en, Register 9, Bit 7,
= 1, GPIO1 functions as an “Out of
Idle” indicator.
When digital
output:
Vol= 20%VDDINT
Voh=80%VDDINT
When digital
input:
Vil= 30%VDDINT
Vih=70%VDDINT
1 mA max source/
sink.
12 RST Digital Input Active Low Reset Pin. While held
low, the IC is “off” and all internal
information is lost from RAM and SPI
registers. When high, IC goes to
IDLE State, with SPI in default state.
Vil= 30%VDDINT
Vih=70%VDDINT
13 RXTXEN Digital Input Active High. Low to high transition
initiates RX or TX sequence
depending on SPI setting. If held
high (e.g., tied to VBATT), SPI
setting starts RX or TX sequence.
Vil= 30%VDDINT
Vih=70%VDDINT
14 ATTN Digital Input Active Low Attention pin. Transitions
IC from either Hibernate or Doze
states to Idle.
Vil=30%VDDINT
Vih=70%VDDINT
15 CLKO Digital Output Clock output to host MCU.
Programmable frequencies of:
16, 8, 4, 2, 1 MHz, and 62.5 kHz,
32.786+ kHz (default),
and 16.393+ kHz
Vol= 20%VDDINT
Voh=80%VDDINT
freq=16MHz (20/80
DC) 20 pF. All
others (50/50 DC)
16 SPICLK Digital Clock
Input
External clock input for the SPI
interface.
Vil= 30%VDDINT
Vih=70%VDDINT
freq= 8 MHz (max)
17 MOSI Digital Input Master Out/Slave In. Dedicated SPI
data input.
Vil= 30%VDDINT
Vih=70%VDDINT
freq=8 Mbps (max)
18 MISO Digital Output Master In/Slave Out. Dedicated SPI
data output.
Vol= 20%VDDINT
Voh=80%VDDINT
1 mA max source/
sink.
19 CE Digital Input Active Low Chip Enable. Activates
SPI.
Vil= 30%VDDINT
Vih=70%VDDINT
20 IRQ Digital Output Active Low Interrupt Request Open drain device.
40 k
Ω internal pull-
up. Interrupt can
be serviced every
6 µs with <20 pF
load. External pull-
up must be >4 k
Ω.
Table 8. Contact Function Description (Continued)
Contact # Contact Name Type Description Functionality
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
nc...