AN2818 Freescale Semiconductor / Motorola, AN2818 Datasheet - Page 17

Manufacturer Part Number

AN2818

Description

Romeo2 Monitor for the MC68HC908AP64 MCU

Manufacturer

Freescale Semiconductor / Motorola

Datasheet

1.AN2818.pdf (20 pages)

Figure 10

(11111111 binary).

Freescale Semiconductor

2. Set CR2 (ID register) to 0x55 using command CR2 55 <return>.

3. Set CR3 register to value 0x08 using command CR3 08 <return>.

4. Set LNA pin to logic 1 using command LNA 1 <return>.

5. Set STROBE pin to logic 1 using command STROBE 1 <return>.

6. Set AGC pin to logic 0 using command AGC 0 <return>.

7. Enable reception of messages using command RECEIVE. This sets the reset pin to logic 1, and

CF = 1 (434 MHz carrier frequency)

MOD = 0 (OOK modulation)

SOE = 1 (strobe oscillator enabled)

SR0/1 = 10 (strobe oscillator ratio — value not important)

DME = 1 (Data Manager Enabled)

HE = 1 (Header enabled)

This configures the following bits:

DR1/0 = 00 (2–2.7kBd data rate range)

MG = 0 (normal mixer gain)

MS = 0 (mixout pin set to mixer output)

PG = 1 (phase comparator gain = low gain mode)

the Romeo2 monitor will display any received data.

shows the above setup after reception of a message containing one byte of data with value 0xff

When receiving messages where the number of data bits is an exact

multiple of eight, Romeo2 may add an extra byte to the end of the message.

Romeo2 Monitor for the MC68HC908AP64 MCU, Rev. 0

NOTE

RF Message Formats