Specifications

The LNA is set to a high-gain mode and the PA is enabled by default during startup when feature bit 5
(0x20) is set and module pin 45 is tied to pin 52.
Default UART remains UART1
The default UART is still designated as UART1. This is consistent with SNAP ports to other devices.
I
2
C Emulation vs. Hardware pins
The hardware I
2
C pins designated as SCL and SDA are assigned to GPIO pins 1 and 2 respectively.
However, hardware I
2
C is not currently enabled within the SNAP core. Instead, the pins associated
with SNAPs I
2
C software emulation (GPIO 17 and 18) remain unchanged from the Synapse RFE and
PAN4555.
Additional PWM Output Pins
PWM on GPIO 0, 14, 15, 31, and 32
On a Synapse RF Engine, only GPIO 0 can perform Pulse Width Modulation (PWM). On the
PAN4555 Wireless Module, GPIO pins 14 and 15 can also do limited
PWM. On the PAN4561 GPIO
pins 31 and 32 can also do limited PWM.
The PWM limitation on these four pins (GPIO 14, 15, 31, 32) has to do with the frequency of the pulse
that can be modulated. On these pins, the pulses occur every 1 millisecond. SNAPpy scripts can affect
the width of the pulses, but not the rate at which they occur. If you need a pulse rate different than 1
per millisecond (for example, you are doing servo motor control), you will have to use GPIO 0.
Refer to example script PAN4561_ledCycling.py for one example of using some of these additional
PWM pins.
getInfo() Differences
A call to the SNAP function getInfo() with a parameter value of 0 will request a “vendor code.”
On a Synapse RFE, getInfo(0) returns 0 (meaning “Synapse”).
On a PAN4561, getInfo(0) returns 2 (meaning “Freescale”).
On a getInfo(3) call, the parameter value of 3 requests a “platform code.” The PAN4561 returns a
value of 5, indicating MC1321x (the chipset the PAN4561 is based on).
SNAPpy scripts can use the getInfo() function to adapt themselves to the board they find themselves
running on. See also section 5 of this document, where an alternate method is explained.
Please refer to the PAN 4561 Product Specification from Panasonic and the MC1321x Reference
Manual from Freescale for more information regarding pin and module functionality.
Page 138 of 202 SNAP Reference Manual Document Number 600-0007K