参数资料
型号: L64781
厂商: LSI CORP
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封装: PLASTIC, QFP-100
文件页数: 37/164页
文件大小: 2003K
代理商: L64781
XCTR Pins Register
5-61
5.12 XCTR Pins Register
The L64781 has three control pins called XCTR0, XCTR1, XCTR2 that
are general-purpose pins to allow the output of various signals.
5.12.1 XCTR Register Pins Operation Modes
The XCTR pins can be used in three different modes:
3-wire mode
In 3-wire mode, the XCTR_OUTx pins are connected to the
WIRES3_OUT(x) register. The 3-wire register emulates the 3-wire
bus protocol and controls the tuner.
The WIRES3_IN register is not multiplexed; only the WIRES3_OUT
is. The WIRES3_IN register is therefore always connected to the
XCTR_IN pins.
Variable-voltage mode
In this mode, each of the three pins (XCTR0, XCTR1, and XCTR 2)
can generate a sigma-delta (
Σ/) output that, after RC ltering,
represents an 8-bit analog value that can be programmed through
internal register. The objective is to allow L64781 users to generate
a constant voltage to be used somewhere on the board, by
programming the corresponding required value in one of the three
8-bit registers (ANALOG_VOLTAGE_1, 2, or 3). Figure 5.8 shows the
overall diagram.
Figure 5.8
Variable-Voltage Mode
Sync pin mode
To allow debug on evaluation boards, the L64781 also uses the
XCTR pins to output some internal synchronization signals, such as
S3, TPS_SYNC, FRAME_SYNC, FREQ_SYNC, CLOCK_SYNC,
START_SYNC.
8
Carry Out
XCTR_1/2/3
CLK18C
ANALOG_VOLTAGE_1/2/3
l64781.book Page 61 Friday, January 19, 2001 1:28 PM
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