HT45B0F
SPI-to-UART Bridge
Features
·
Operating Voltage
-
Transmit and Receive Multiple Interrupt
f
CLKI
= 12MHz: 2.0V~5.5V
CLKI
f
CLKI
= 20MHz: 4.5V~5.5V
·
Glueless slave SPI interface to Holtek¢s MCU
·
Full-duplex, Universal Asynchronous Receiver and
-
Transmitter (UART) communication
-
-
-
-
-
-
-
-
-
8 or 9 bit character length
Even, odd or no parity options
One or two stop bits
Baud rate generator with 8-bit prescaler
Parity, framing, noise and overrun error detection
Support for interrupt on address detect
Address Detect Interrupt - last character bit=1
Transmitter and receiver enabled independently
4-byte deep FIFO receiver data buffer
Generation Sources:
¨
Transmitter Empty
¨
Transmitter Idle
¨
Receiver Full
¨
Receiver Overrun
¨
Address Mode Detect
-
TX pin is high impedance when the UART transmit
module is disabled
-
RX pin is high impedance when the UART receive
module is disabled
·
CMOS clock input, CLKI, up to 20MHz at 5V
operating voltage
·
16-pin NSOP package
General Description
The HT45B0F is microcontroller peripheral device to im-
plement SPI-to-UART data conversions. The UART
module can operate in full-duplex mode with an interrupt
output capability to the host microcontroller.
Possible application could include data communication
networks between microcontrollers, low-cost data links
between PCs and peripheral devices, portable and bat-
tery operated devices, factory automation and process
control to name but a few.
Block Diagram
S D I
S D O
S C K
V
D D
S e r ia l
I/O
In te rfa c e
U A R T
M o d u le
T X
R X
S C S
C L K I
IN T
G N D
V D D
Rev. 1.00
1
June 7, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
