Data Sheet

FSC-BT956B Datasheet
Shenzhen Feasycom Technology Co., Ltd www.feasycom.com
-17-
1 32-bit incremental hardware delay timer, ticks of 16384Hz.
1 24-bit decremental watchdog timer, ticks of 32768Hz.
Multiple IRQ sources: timers wrap, interval arrives.
4.13 Debug Host
Debug Host module contains 1 normal Universal Asynchronous Receiver Transmitter channels (UART) and 1 Debug
UART. The two UARTs share the same TX/RX engines, which sends and receives byte data from serial interface. Each
UART has its own control sub-module and own APB interface. Debug Host module parses the incoming data from serial
interface to switch between the normal UART and the Debug UART.
Normal UART
The normal UART can be used for traces and other purposes. For APB interface, it is exactly the same to the other
UARTs in the system. However, if Debug UART is enabled, it should have the same serial interface configuration as
the Debug UART. Some of its configuration options will be masked in this case. To adapt different clock frequency,
the normal UART uses asynchronous FIFO, which uses gray code to represent the read and write pointer positions.
Debug UART
The Debug UART is specially designed for communicating debug information with a PC host. The serial interface of
Debug UART is a simplified version of the normal UART and is less configurable. Each sample is sent serially, has 1
start bit (always zero), 8 data bits, and 1 stop bits (always one). Breaks (data line held low) can be generated and
detected allowing resynchronizing the two devices.
5. ELECTRICAL CHARACTERISTICS
5.1 Absolute Maximum Ratings
Absolute maximum ratings for supply voltage and voltages on digital and analogue pins of the module are listed below.
Exceeding these values causes permanent damage.
The average PIO pin output current is defined as the average current value flowing through any one of the
corresponding pins for a 100mS period. The total average PIO pin output current is defined as the average current
value flowing through all of the corresponding pins for a 100mS period. The maximum output current is defined as the
value of the peak current flowing through any one of the corresponding pins.
Table 4: Absolute Maximum Rating
Parameter
Min
Max
Unit
V
CHG
- DC Power Supply
-0.3
+6
V
V
BAT
- Input Voltage
Vss-0.3
+4.5
V
T
A
- Operating Temperature
-20
+65
°C
T
ST
- Storage Temperature
-40
+90
°C
I
IO
- Maximum Current sunk by a I/O pin
12.8
mA
I
IO
- Maximum Current sourced by a I/O pin
12.8
mA