AVR 161S (serv.man4) - Harman Kardon Audio Service Manual (repair manual). Page 109

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Product Specification 
Spec-BM840-V1.1                                    Page 3 of 7                                     www.sunitec.com.tw  
Pin Configurations 
PIN NO. 
NAME 
TYPE 
FUNCTION 
RE-MARK
1 GND 
GND 
Ground 
 
2 GND 
GND 
Ground 
 
AIO0 
Bi-directional 
Analogue programmable input / output line 
 
PIO12 
Bi-directional 
Programmable Input/Output Line 
Alternative function: 
■ QSPI_FLASH_CS#: serial quad I/O flash chip select 
■ I2C_WP: I²C bus memory write protect line 
 
PIO14 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ UART_RX: UART data input 
 
PIO11 
Bi-directional 
Programmable Input/Output Line 
Alternative function: 
■ QSPI_IO[0]: serial quad I/O flash data bit 0 
■ I2C_SDA: I²C serial data line 
 
PIO17 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ UART_CTS: UART clear to send, active low 
 
PIO10 
Bi-directional 
Programmable Input/Output Line 
Alternative function: 
■ QSPI_FLASH_CLK: serial quad I/O flash clock 
■ I2C_SCL: I²C serial clock line 
 
PIO15 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ UART_TX: UART data output 
 
10 
PIO16 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ UART_RTS: UART request to send, active low 
 
11 
PIO13 
Bi-directional 
Programmable Input/Output Line 
Alternative function: 
■ QSPI_IO[1]: serial quad I/O flash data bit 1 
 
12 GND 
GND 
Ground 
 
13 
PIO2 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ SPI_MOSI: SPI data input 
■ PCM1_IN: PCM1 synchronous data input 
 
14 
PIO5 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ SPI_CLK: SPI clock 
■ PCM1_CLK: PCM1 synchronous data clock 
 
15 
PIO4 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ SPI_CS#: chip select for SPI, active low 
■ PCM1_SYNC: PCM1 synchronous data sync 
 
16 
PIO3 
Bi-directional 
Programmable Input/Output Line 
Alternative functions: 
■ SPI_MISO: SPI data output 
■ PCM1_OUT: PCM1 synchronous data output 
 
17 GND 
GND 
Ground 
 
18 LED1 
Bi-directional  LED 
driver. 
Alternative function: programmable output PIO[30]. 
 
19 LED0 
Bi-directional  LED 
driver. 
Alternative function: programmable output PIO[29]. 
 
20 RST# 
Input 
with 
strong 
pull-up 
Reset if low. Pull low for minimum 5ms to cause a 
reset. 
 
21 SPI_PCM# 
Bidirectional 
with 
weak 
pull-down 
SPI/PCM select input: 
■ 0 = PCM/PIO interface 
■ 1 = SPI 
 
22 
VREGENABLE 
CMOS Input 
Regulator enable input 
Can also be sensed as an input. 
Regulator enable and multifunction button. A high input 
(tolerant to VBAT) enables the on-chip regulators, 
which can then be latched on internally and the button 
used as a multifunction input 
 
23 GND 
GND 
Ground 
 
24 
VBUS 
Power Input 
Charger input. 
 
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