298
CHAPTER 12 U-TIMER (16-bit Timer for UART Baud Rate Generation)
12.1
Overview
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. Also, since it generates an interrupt by count underflow, it can be used as
an interval timer.
The MB91260B series have three built-in channels for this timer. When used as an
interval timer, two pairs of U-TIMERs can be cascaded to count a maximum interval of
2
32
×
φ
.
Only a combination of ch.0 and ch.1, and a combination of ch.0 and ch.2 can be
connected in cascade mode.
■
Register List
■
Block Diagram
Figure 12.1-1 Block Diagram for U-TIMER
15
8 7
0
UTIM0 to UTIM2
(R)
UTIMR0 to UTIMR2
(W)
21UTIMC0 to UTIMC2
(R/W)
underflo
w
load
15
15
0
0
to UART
clock
φ
(Peripheral clock)
UTIMR0 to UTIMR2 (reload register)
UTIM0 to UTIMR2 (timer)
MUX Channel
0 only
underflo
w
U-TIMER 1
F/F
control
Summary of Contents for FR60Lite
Page 3: ......
Page 5: ......
Page 115: ...100 CHAPTER 3 CPU AND CONTROL UNITS ...
Page 127: ...112 CHAPTER 4 I O PORTS ...
Page 143: ...128 CHAPTER 5 INTERRUPT CONTROLLER ...
Page 155: ...140 CHAPTER 6 EXTERNAL INTERRUPT AND NMI CONTROLLER ...
Page 197: ...182 CHAPTER 9 PPG Programmable Pulse Generator ...
Page 337: ...322 CHAPTER 13 UART ...
Page 417: ...402 CHAPTER 16 DMAC DMA Controller ...
Page 445: ...430 CHAPTER 17 FLASH MEMORY ...
Page 451: ...436 CHAPTER 18 SERIAL PROGRAMMING CONNECTION ...
Page 493: ...478 APPENDIX F Precautions on Handling ...
Page 494: ...479 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 507: ...492 INDEX ...
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