參數(shù)資料
型號： M37542M4-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO36
封裝： 8.4 X 15 MM, 0.80 MM PITCH, PLASTIC, SSOP-36
文件頁數(shù)： 56/124頁
文件大小： 1238K
代理商： M37542M4-XXXFP
7542 Group
Rev.3.03
Jul 11, 2008
Page 35 of 117
REJ03B0006-0303
Fig. 34 Block diagram of timer A and timer B
Timer A (low-order) latch (8)
Timer A (low-order) (8)
Timer A (high-order) latch (8)
Timer A (high-order) (8)
Data bus
Timer A interrupt
request
Compare
Capture
Timer B (low-order) latch (8)
Timer B (low-order) (8)
Timer B (high-order) latch (8)
Timer B (high-order) (8)
Data bus
Timer B interrupt
request
Compare
Capture
1/2
1/16
1/32
1/64
1/128
1/256
Timer A count
stop bit
Timer A
count source
selection bits
On-chip
oscillator
Timer A write
control bit
Timer B write
control bit
1/2
1/16
1/32
1/64
1/128
1/256
Timer B count
stop bit
Timer B count source
selection bits
Frequency
divider
On-chip
oscillator
XIN
“00”
“01”
“11”
Clock division
ratio selection
bits
“10”
Frequency
divider
CPU mode register
Fig. 32 Structure of timer A, B mode register
Fig. 33 Timer count source set register
Timer A, B mode register
(TABM : address 001D16, initial value: 0016)
b7
b0
Timer A write control bit
0 : Write to latch and timer simultaneously
1 : Write to only latch
Timer A count stop bit
0 : Count start
1 : Count stop
Timer B write control bit
0 : Write to latch and timer simultaneously
1 : Write to only latch
Timer B count stop bit
0 : Count start
1 : Count stop
Not used (return “0” when read)
Compare 0, 1 modulation mode bit
0: Disabled
1: Enabled
Compare 2, 3 modulation mode bit
0: Disabled
1: Enabled
b7
b0
Timer X count source selection bits
b1 b0
0
0 : f(XIN)/16
0
1 : f(XIN)/2
1
0 : f(XIN) (Note 1)
1
1 : Not available
Notes 1: f(XIN) can be used as timer X count source when using
a ceramic resonator or on-chip oscillator.
Do not use it at RC oscillation.
2: On-chip oscillator can be used when the on-chip oscillator
is enabled by bit 3 of CPUM.
Timer count source set register
(TCSS : address 002A16, initial value: 0016)
Timer B count source selection bits
b7 b6 b5
0
0 : f(XIN)/16
0
1 : f(XIN)/2
0
1
0 : f(XIN)/32
0
1
1 : f(XIN)/64
1
0
0 : f(XIN)/128
1
0
1 : f(XIN)/256
1
0 : Timer A underflow
1
1 : Not available
Timer A count source selection bits
b4 b3 b2
0
0 : f(XIN)/16
0
1 : f(XIN)/2
0
1
0 : f(XIN)/32
0
1
1 : f(XIN)/64
1
0
0 : f(XIN)/128
1
0
1 : f(XIN)/256
1
0 : On-chip oscillator output (Note 2)
1
1 : Not available
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