HT45B0F Datasheet, PDF (1/23 Pages) Holtek Semiconductor Inc – SPI-to-UART Bridge

HT45B0F
SPI-to-UART Bridge
Features
· Operating Voltage
- f_CLKI= 12MHz: 2.0V~5.5V
- f_CLKI= 16MHz: 2.7V~5.5V
- 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
- Transmit and Receive Multiple Interrupt
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
SDI
SDO
UART
TX
SCK
S e r ia l
I/O
M o d u le
RX
V D D _{In te rfa c e}
GND
SCS
VDD
C LK I
IN T
Rev. 1.00
1
June 7, 2011