280
CHAPTER 13 8/16-BIT UP/DOWN COUNTER/TIMER
13.5.1 Reload/compare function
The 8/16-bit up/down counter/timer has reload and compare functions. These two
functions may be mixed for processing.
■
Selection of reload and compare functions
Table 13.5-3 shows an example of selecting reload and compare functions.
■
Reload function
At the start of the reload function, the RCR value is transferred to UDCR at the timing of the
down-count clock next to the clock in which an underflow occurs. In this example, UDFF is
specified, and an interrupt request occurs.
In a mode where there is no down counting (decrement), the start of this function is disabled.
Figure 13.5-3 Outline of reload function operation
Table 13.5-3 Selection example of reload/compare function
RLDE, UCRE
Reload and compare functions
00
B
Reload/compare prohibit (initial value)
01
B
Compare permit
10
B
Reload permit
11
B
Reload/compare permit
(0FFFF
H
)
0FF
H
00
H
RCR
Reload/interrupt generated
Reload/interrupt generated
Underflow
Underflow
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: ......