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Registers
MDMTEST0 (0x61B8) – Test Register for Modem
Bit Name Reset R/W Description
No.
7:4
TX_TONE[3:0]
0111 R/W Enables the possibility to transmit a baseband tone by picking samples from the sine
tables with a controllable phase step between the samples. The step size is
controlled by TX_TONE. If MDMTEST1.MOD_IF is 0, the tone is superpositioned on
the modulated data, effectively giving modulation with an IF. If MDMTEST1.MOD_IF is
1, only the tone is transmitted.
0000: –6 MHz
0001: –4 MHz
0010: –3 MHz
0011: –2 MHz
0100: –1 MHz
0101: –500 kHz
0110: –4 kHz
0111: 0
1000: 4 kHz
1001: 500 kHz
1010: 1 MHz
1011: 2 MHz
1100: 3 MHz
1101: 4 MHz
1110: 6 MHz
Others: Reserved
3:2
DC_WIN_SIZE[1:0]
01 R/W Controls the number of samples to be accumulated between each dump of the
accumulate-and-dump filter used in dc removal.
00: 32 samples
01: 64 samples
10: 128 samples
11: 256 samples
1:0
DC_BLOCK_MODE[1:0]
01 R/W Selects the mode of operation:
00: The input signal to the dc blocker is passed on to the output without any
attempt to remove dc.
01: Enable dc cancellation. Normal operation
10: Freeze estimates of dc when sync is found. Start estimating dc again when
searching for the next frame
11: Reserved
MDMTEST1 (0x61B9) – Test Register for Modem
Bit Name Reset R/W Description
No.
7:5 – 000 R0 Reserved. Read as 0
4
MOD_IF
0 R/W
0: Modulation is performed at an IF set by MDMTEST0.TX_TONE.
1: A tone is transmitted with frequency set by MDMTEST0.TX_TONE.
3
RAMP_AMP
1 R/W 1: Enable ramping of DAC output amplitude during startup and finish.
0: Disable ramping of DAC output amplitude
2
RFC_SNIFF_EN
0 R/W 0: Packet sniffer module disabled
1: Packet sniffer module enabled. The received and transmitted data can be
observed on GPIO pins.
1
MODULATION_MODE
0 R/W Set one of two RF modulation modes for RX/TX
0: IEEE 802.15.4 compliant mode
1: Reversed phase, non-IEEE compliant
0 RESERVED 0 R/W Reserved. Do not write.
281
SWRU191C–April 2009–Revised January 2012 CC253x Radio
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