DS07-16301-4E Datasheet, PDF (43/99 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91101/MB91101A
4. U-TIMER (16-bit Timer for UART Baud Rate Generation)
The U-TIMER is a 16-bit timer for generating UART baud rate. Combination of chip operating frequency and
reload value of U-TIMER allows flexible setting of baud rate.
The U-TIMER operates as an interval timer by using interrupt issued on counter underflow.
The MB91101 and MB91101A have 3 channel U-TIMER embedded on the chip. An interval of up to 2¹⁶ × φ can
be counted.
• Block diagram
bit 15
bit 15
φ
(Peripheral clock)
UTIMR (reload register)
Load
UTIM ( U-TIMER register)
Clock
Underflow
f.f.
bit 0
bit 0
Control
To UART
• Register configuration
Address bit 15
00000078H
00000079H
0000007CH
0000007DH
00000080H
00000081H
0000007BH
0000007FH
00000083H
bit 0 Initial value
UTIM0/UTIMR0
UTIM1/UTIMR1
UTIM2/UTIMR2
UTIMC0
0 0 0 0 0 0 0 0B
0 0 0 0 0 0 0 0B
0 0 0 0 0 0 0 0B
0 0 0 0 0 0 0 0B
0 0 0 0 0 0 0 0B
0 0 0 0 0 0 0 0B
0 - - 0 0 0 0 1B
(R/W)
(R/W)
(R/W)
(R/W)
UTIMC1
0 - - 0 0 0 0 1B (R/W)
UTIMC2
0 - - 0 0 0 0 1B (R/W)
( ) :Access
R/W :Readable and writable
– :Unused
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