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CHAPTER 14 16-BIT RELOAD TIMER
14.2.2 16-Bit Timer Register (TMR)/16-Bit Reload Register
(TMRLR)
This section describes the configuration and functions of the 16-bit timer register
(TMR)/16-bit reload register (TMRLR).
■
16-bit timer register (TMR)/16-bit reload register (TMRLR)
The bit configuration of the 16-bit timer register (TMR)/16-bit reload register (TMRLR) is shown
below.
■
16-bit timer register (TMR)
This register reads the counter value of the 16-bit decrement counter. If counter operation is
enabled (TMCSR: CNTE = 1) and counting starts, the value written to the 16-bit reload register
is loaded into this register to start count-down. In count stop state (TMCSR: CNTE = 0), the
value of this register is retained.
Note:
This register can be read during count operation, but always use a word transfer instruction (such
as "MOVW A 003AH").
The 16-bit timer register (TMR) is functionally a read-only register; however, it is allocated at the
same address as the write-only 16-bit reload register (TMRLR). Thus, write operations will not
affect the TMR value, even though writing to TMRLR is performed.
15
14
13
12
11
10
9
8
0000CD
H
D15 D14 D13 D12 D11 D10 D09 D08 TMR/TMRLR
(upper
bits)
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) Read/write
(X) (X) (X) (X) (X) (X) (X) (X) Initial
value
7 6 5 4 3 2 1 0
0000CC
H
D07 D06 D05 D04 D03 D02 D01 D00 TMR/TMRLR
(lower
bits)
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) Read/write
(X) (X) (X) (X) (X) (X) (X) (X) Initial
value
Summary of Contents for MB90480 Series
Page 2: ......
Page 4: ......
Page 10: ...vi ...
Page 128: ...106 CHAPTER 4 RESET ...
Page 174: ...152 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 198: ...176 CHAPTER 7 MODE SETTING ...
Page 220: ...198 CHAPTER 9 TIMEBASE TIMER ...
Page 238: ...216 CHAPTER 11 WATCH TIMER ...
Page 280: ...258 CHAPTER 12 16 BIT INPUT OUTPUT TIMER ...
Page 406: ...384 CHAPTER 17 8 10 BIT A D CONVERTER ...
Page 478: ...456 CHAPTER 20 CHIP SELECTION FACILITY ...
Page 494: ...472 CHAPTER 21 ADDRESS MATCH DETECTION FUNCTION ...
Page 498: ...476 CHAPTER 22 ROM MIRROR FUNCTION SELECTION MODULE ...
Page 526: ...504 CHAPTER 23 2M 3M BIT FLASH MEMORY ...
Page 536: ...514 CHAPTER 24 EXAMPLES OF MB90F481B MB90F482B MB90F488B MB90F489B SERIAL PROGRAMMING ...
Page 570: ...548 CHAPTER 25 PWC TIMER ONLY MB90485 SERIES ...
Page 688: ......