SM8521 Datasheet, PDF (47/56 Pages) Sharp Electrionic Components – 8-Bit Single-Chip Microcomputer

UNIVERSAL ASYNCHRONOUS RECEIVER
AND TRANSMITTER (UART) INTERFACE
SM8521 supports 1-channel universal asynchronous
receiver and transmitter interface (UART) .
The UART interrupt has the following features.
• Transmitter and receiver are independent each
other, full duplex communication possible.
• Receiver is consisted of duplex buffer, able to
receive data continuously.
• The dedicated register for baud rate generator is
built-in.
SM8521
• It is possible to choose transfer format as
following.
• Stop bit : 1-bit/2-bit
• Parity bit : even parity/odd parity/no parity
• Receive error can be detected.
• Frame error
• Parity error
• Overrun error
NOTE :
UART baud rate is fixed at [Timer 0 output/32]. Regarding
Timer 0, refer to "8-Bit Timer Register TM0C".
P70/RXD
Receive data
P _{shift register}
Interrupt request signal
to bit IR03 (bit 3 : IR0)
Receiver data
register URTR
Status register
URTS
Data bus
TXD
Transmit data
register URTT
P
Control register
URTC
Timer 0 output
Divider
(Divided by 16)
: A control register mapped by register file
Fig. 25 UART Block Diagram
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