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CHAPTER 13 U-TIMER
13.1
Overview
This section provides an overview and a block diagram of the U-TIMER (16 bit timer for
UART baud rate generation).
■ Overview of the U-TIMER
The U-TIMER is a 16-bit timer used to generate the baud rate for the UART. Use a combination
of a chip operating frequency and a reload value of the U-TIMER to specify a baud rate.
The MB91319 has five built-in channels for this timer.
■ Block Diagram
Figure 13.1-1 shows the block diagram of the U-TIMER.
φ
(Peripheral Clock)
250
Figure 13.1-1 Block Diagram of the U-TIMER
15
UTIMR (reload register)
15
UTIM (timer)
clock
0
load
0
underflow
f.f.
control
to UART
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