243
9.3 U-TIMER Operation
9.3
U-TIMER Operation
This section explains how to calculate the U-TIMER baud rate and also explains the
cascade mode.
■
Calculating the Baud Rate
The UART uses the underflow flip-flop (f.f. in the figure) of the corresponding U-TIMER (U-
TIMERx --> UARTx, x = 0, 1, 2) as the baud rate clock source.
❍
Asynchronous (start-stop) mode
The UART uses the U-TIMER output by dividing it by 16.
❍
CLK synchronous mode
■
Cascade Mode
U-TIMER channels 0 and 1 can be used in cascade mode. Figure 9.3-1 shows an example of
cascade mode in which UTIMR channel 0 is set to 0100 and UTIMR channel 1 is set to 0002.
Figure 9.3-1 Example of Using U-TIMER Channels 0 and 1 in Cascade Mode
n: UTIMR (Reload value)
bps =
UCC1=0
(2n+2)
16
: Peripheral machine clock frequency
(variable with the gear)
bps =
UCC1=1
(2n+3)
16
n: UTIMR (Reload value)
bps =
UCC1=0
(2n+2)
bps =
UCC1=1
(2n+3)
: Peripheral machine clock frequency
(variable with the gear)
UTIM ch.1
01
00
02
01
00
02
01
00
02
01
00
02
01
00
02
01
00
02
01
00
f.f.
ch.1
UTIM ch.0
0002
0001
0000
0100
f.f.
ch.0
Summary of Contents for MB91F109
Page 2: ......
Page 3: ...FUJITSU LIMITED FR30 32 Bit Microcontroller MB91F109 Hardware Manual ...
Page 4: ......
Page 10: ...vi ...
Page 24: ...xx ...
Page 96: ...72 CHAPTER 2 CPU ...
Page 224: ...200 CHAPTER 4 BUS INTERFACE ...
Page 234: ...210 CHAPTER 5 I O PORTS ...
Page 268: ...244 CHAPTER 9 U TIMER ...
Page 290: ...266 CHAPTER 10 UART ...
Page 314: ...290 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 322: ...298 CHAPTER 13 BIT SEARCH MODULE ...
Page 392: ...368 CHAPTER 16 FLASH MEMORY ...
Page 432: ...408 APPENDIX E Instructions F Table E 2 Instruction Formats OP rel11 5 11 ...
Page 448: ...424 APPENDIX E Instructions ...
Page 449: ...425 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 458: ...434 INDEX ...
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Page 461: ...FUJITSU SEMICONDUCTOR FR30 32 Bit Microcontroller MB91F109 Hardware Manual ...