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CHAPTER 12 16-BIT RELOAD TIMER
12.4.4
16-bit Reload Register (TMRD0/TMRD1)
The 16-bit reload register (TMRD0/TMRD1) sets a reload value in the 16-bit down
counter. The value written to this register is loaded into the down counter, and the
value is counted down.
■
16-bit Reload Register (TMRD0/TMRD1)
Figure 12.4-5 shows the 16-bit reload registers (TMRD0/TMRD1).
Figure 12.4-5 16-bit Reload Register (TMRD0/TMRD1)
The initial value of the counter is set in this register when counting is disabled (TMCSRL0/
TMCSRL1:CNTE = 0), regardless of the operating mode of the 16-bit reload timer. When counting is
enabled (TMCSRL0/TMCSRL1:CNTE = 1) and the counter is started, counting down starts from the value
written to this register.
In reload mode, the value set in the 16-bit reload register (TMRD0/TMRD1) is reloaded into the counter
when an underflow occurs, and counting down continues. In single-shot mode, the counter stops at FFFF
H
when an underflow occurs.
Notes:
• Write a value to this register in the counter stop (TMCSRL0/TMCSRL1:CNTE = 0) state. Also,
always use a word transfer instruction (MOVW 003AH, A etc.) to write a value to this register.
• Although the 16-bit reload register (TMRD0/TMRD1) is functionally a write-only register, it is
allocated to the same address as the read-only 16-bit timer registers (TMR0/TMR1). Accordingly,
since the read value is used as the TMR0/TMR1 value, the INC/DEC instruction and other
instructions for read-modify-write (RMW) operations cannot be used.
15
14
13
12
11
10
9
8
W
X
W
X
W
X
W
X
W
X
W
X
W
X
W
X
D15
D12
D11
D10
D09
D08
7
6
5
4
3
2
1
0
16-bit Reload Register (Upper)
16-bit Reload Register (Lower)
TMRD0/TMRD1
TMRD0/TMRD1
Initial value
Read/write
W
X
W
X
W
X
W
X
W
X
W
X
W
X
W
X
Initial value
Read/write
D07
D06
D05
D04
D03
D02
D01
D00
D13
D14
Address: ch.0 000085
H
ch.1 000089
H
Address: ch.0 000084
H
ch.1 000088
H
bit
bit
Содержание MB90460 Series
Страница 1: ...The following document contains information on Cypress products ...
Страница 3: ......
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Страница 9: ...iv ...
Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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