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65
MB90670/675 Series
11. UART1 (SCI)
UART1 (SCI) is a general-purpose serial data communication interface for performing synchronous or
asynchronous communication (start-stop synchronization system). In addition to the normal duplex
communication function (normal mode), UART1 has a master-slave type communication function (multi-
processor mode).
Data buffer: Full-duplex double buffer
Transfer mode: Clock synchronized (no start or stop bit)
Clock asynchronized (start-stop synchronization system)
Baud rate: With dedicated baud rate generator, selectable from 8 types
External clock input possible
Internal clock (a internal clock supplied from 16-bit reload timer can be used.)
Data length: 7 bits (for asynchronous normal mode only)
8 bits
Signal format: NRZ (Non Return to Zero) system
Reception error detection: Framing error
Overrun error
Parity error (not available in multi-processor mode)
Interrupt request: Receive interrupt (receptioncomplete, receive error detection)
Receive interrupt (transmission complete)
Transmit/receive conforms to extended intelligent I/O service (EI
2
OS)
Master/slave type communication function (multi-processor mode):1 (master) to n (slave) communication
possible (supported only for master station)
(1) Register Configuration
Control register 1 (SCR1)
R/W: Readable and writable
R : Read only
W : Write only
— : Unused
X : Indeterminate
Address
000025
H
bit 7............
PEN
R/W
Initial value
00000100
B
P
SBL
R/W
CL
R/W
A/D
R/W
REC RXE
R/W
TXE
R/W
(SMR1)
bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9
bit 8
R/W
R/W
Address
000024
H
bit 15............
(SCR1)
Initial value
00000000
B
MD0 CS2
R/W
CS1
R/W
CS0 BCH
SCKE
SOE
R/W
R/W
R/W
R/W
R/W
R/W
bit 7
MD1
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Address
000027
H
bit 7............
PE
R
Initial value
00001-00
B
ORE
R
FRE
RDRF TDRE
R
R
—
—
RIE
R/W
TIE
R/W
(SIDR1/SODR1)
bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9
bit 8
R
Address
000026
H
bit 15............
(SSR1)
Initial value
XXXXXXXX
B
D6
R
D5
R
D4
R
D3
R
D2
R
D1
R
D0
R
R
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
D7
Address
000026
H
bit 15............
(SSR1)
Initial value
XXXXXXXX
B
D6
W
D5
W
D4
W
D3
W
D2
W
D1
W
D0
W
W
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
D7
Mode register 1 (SMR1)
Status register 1 (SSR1)
Input data register 1 (SIDR1)
Output data register 1 (SODR1)