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4.9. PCM Interface

SIM800H&SIM800L provides a hardware PCM interface:

Table 20: PCM pin definition

Pin name

Pin number

Description

PCM_CLK

PCM clock

PCM_OUT

PCM data output

PCM_SYNC

PCM synchrony

PCM_IN

PCM data input

SIM800H&SIM800L PCM interface only supply master mode, data length is 16 bits (linear)，PCM clock rate

is 256kHz.

Table 21: PCM specification

Parameter

Specification

Line Interface Format

Linear(Fixed)

Data length

16bits(Fixed)

PCM Clock/Sync Source

Master Mode(Fixed)

PCM Clock Rate

256kHz(Fixed)

PCM Sync Format

Short sync/Long sync both support

Zero Padding/Sign extension

Zero Padding(Fixed)

Data Ordering

MSB/LSB both support

Note: Customer can use AT command control PCM interface. For detail, please refer to document [1].

4.9.1.

PCM Multiplexing Function

With GPIO17 and GPIO19, PCM interface can be configured as SPI or SD interface, the following table shows

the detailed multiplexing function.

Table 22: PCM multiplexing function

Pin name

Pin number

Mode 0(default)

Mode 1

Mode 2

Mode 3

PCM_CLK

DISP_RST

SD_CMD

GPIO18

PCM_OUT

DISP_DI

SD_DATA3

GPIO19

PCM_SYNC

DISP_CS

SD_CLK

GPIO20

PCM_IN

DISP_DATA

SD_DATA2

GPIO21

GPIO2

DISP_D/C

SD_DATA0

GPIO3

DISP_CLK

SD_DATA1

Note: Customer can use AT command set mode. For detail, please refer to document [1].

SIM800H&SIM800L_Hardware Design_V2.02

2015-07-27

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