TCM4400 Datasheet, PDF (64/72 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

4.10.19 Automatic Frequency Control Registers (1 and 2)
There are two AFC control registers; each is 10 bits wide. AFC control register 1 contains the least significant
bit of the AFC D/A converter output. AFC control register 2 contains the most significant bit of the AFC DAC
input. See Table 4–26 and Table 4–27. The AFC value is loaded after writing to the AFC MSB register (first)
and then the LSB register (second).
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _BIT9
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ R/W
0
Table 4–26. AFC Control Register 1
AUXAFC1: AUTOMATIC FREQUENCY CONTROL REG1
BIT8 BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1
R/W R/W R/W R/W R/W R/W R/W R/W
0
0
0
0
0
0
0
0
BIT0
R/W
0
ADDRESS: 14 R/W
0 1 1 1 0 1/0
←ACCESS TYPE
←VALUE AT RESET
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Bits 9–0: LSB input of the 13-bit AFC DAC in 2s complement}
Table 4–27. AFC Control Register 2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{AUXAFC2: AUTOMATIC FREQUENCY CONTROL REG2}
ADDRESS:
R/W
15
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{RE RE RE RE RE RE RE BIT12 BIT11 BIT10 0 1 1 1 1}
1/0
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{SRVD SRVD SRVD SRVD SRVD SRVD SRVD}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{R = 0 R = 0 R = 0 R = 0 R = 0 R = 0 R = 0 R/W R/W R/W}
←ACCESS TYPE
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 0
0
0
0
0
0
0
0
0
0
←VALUE AT RESET
Bits 12 –10: MSB input of the 13-bit AFC DAC in 2s complement
4.10.20 Automatic Power Control Register
The values in the automatic power control (APC) register set the operating conditions for the APC circuit
(see Table 4–28).
Table 4–28. APC Register
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{AUXAPC: AUTOMATIC POWER CONTROL REGISTER}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{RESERVD RESERVD BIT7 BIT6 BIT5 BIT4 BIT3 BIT2}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ R = 0
R=0
R/W R/W R/W R/W R/W R/W
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ⁰
0
0
0
0
0
0
0
BIT1
R/W
0
BIT0
R/W
0
ADDRESS: 16 R/W
1 0 0 0 0 1/0
←ACCESS TYPE
←VALUE AT RESET
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Bits 7–0: Input of the 8-bit level APC DAC}
RESERVD: Reserved bits for testing
4–28