RCA RDR3600V, Service Manual

Page: 14 / 55

chart 2--- CPU pin Port definition:
Pin Type Name
Pin definition
Explain
23 I
PA0/
ADC123_IN0
MANDOWN
(Reserved) MANDOWN input;
24 I
PA1/
ADC123_IN1
BATT
Battery voltage detection; the maximum input
voltage of 2.8v.
25 I
PA2/
ADC123_IN2
QT/DQT_IN
QT/DQT input
26 I
PA3/
ADC123_IN3
VOX
VOX detection input
29 O
PA4/
DAC_OUT1
APC/TV
Transmit power control and receive tuned
D / A outputs
30 O
PA5/
DAC_OUT2
MOD2_BIAS
Controls the TCXO reference frequency D /
A output
31 I
PA6/
ADC12_IN6
POWER_DET
Power switch input, high level indicates
that the power is turned on.
32 O PA7 POWER_C
Power on control; active high.
67 O PA8 SAVE
5C power supply power control; active high.
68 I/O
PA9/
USART1_TX
串口TXD/
SELC
Reserved Bootloader TX; Alternate external access control
input, then the first part of the external accessories.
69 I
PA10/
USART1_RX
串口RXD/
EXT_PTT
Reserved Bootloader RX; multiplexed external PTT input,
external accessory pin 9.
70 I/O PA11/USBDM USBD-
USB data cable DM, then the external
accessories 5 feet.
71 I/O PA12/USBDP USBD+
USB data cable DP, access to external accessories 4
feet.
72 I/O
JTMS-SWDIO/
PA13
SWDIO/
WORN_SW
Reserved JTAG interface; multiplexed with external accessories
pin 2. Reserved wide and narrowband to receive volume switching,
high level for broadband.
76 I/O
JTCK-SWCLK/
PA14
SWCLK/
MANDOWN_SW
Reserved JTAG interface; multiplexed access to external
accessories 12 feet. Reserved MANDOWN power switch, active
high.
77 O
PA15/
I2S3_WS
I2S_FS
Connect to HR_C5000 pin 37 I2S_FS
35 I
PB0/
ADC12_IN8
RSSI
RSSI detection input
36 I
PB1/
ADC12_IN9
BUSY
BUSY detection
37 I/O PB2/BOOT1
BOOT1/
FM_SW
The default 10K resistor is grounded. Used as output port,
the default working state is 0, reduce power consumption.
Multiplexed for FM reception IF channel switch control;
active high.
89 O
PB3/
SPI3_SCK
V_SCLK Connect the HR_C5000 to the 43rd pin V_SCLK