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M306V5ME-XXXSP Datasheet(PDF) 83 Page - Mitsubishi Electric Semiconductor

Part No. M306V5ME-XXXSP
Description  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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Maker  MITSUBISHI [Mitsubishi Electric Semiconductor]
Homepage  http://www.mitsubishichips.com
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M306V5ME-XXXSP Datasheet(HTML) 83 Page - Mitsubishi Electric Semiconductor

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M306V5ME-XXXSP
M306V5EESP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
83
Rev. 1.0
Item
Specification
Count source
• External signals input to TB0IN pin
• Effective edge of count source can be a rising edge, a falling edge, or falling and
rising edges as selected by software
Count operation
• Counts down
• When the timer underflows, it reloads the reload register contents before continuing
counting
Divide ratio
1/(n+1)
n : Set value
Count start condition
Count start flag is set (= 1)
Count stop condition
Count start flag is reset (= 0)
Interrupt request generation timing The timer underflows
TB0IN pin function
Count source input
Read from timer
Count value can be read out by reading timer Bi register
Write to timer
• When counting stopped
When a value is written to timer Bi register, it is written to both reload register and counter
• When counting in progress
When a value is written to timer Bi register, it is written to only reload register
(Transferred to counter at next reload time)
Table 2.10.6 Timer specifications in event counter mode
Figure 2.10.22 Timer Bi mode register in event counter mode (i = 0 to 2)
(2) Event counter mode
In this mode, the timer counts an external signal or an internal timer’s overflow. (See Table 2.10.6) Figure
2.10.22 shows the timer Bi mode register in event counter mode.
Timer Bi mode register
SymbolAddressWhen reset
TBiMR(i=0 to 2)039B16 to 039D16
00?X00002
Bit nameFunction
Bit symbol
W
R
b7b6b5b4b3b2b1b0
Operation mode select bit
0 1 : Event counter mode
b1 b0
TMOD1
TMOD0
MR0
Count polarity select
bit (Note 1)
MR2
MR1
MR3
TCK1
TCK0
01
0 0 : Counts external signal's falling
edges
0 1 : Counts external signal's rising
edges
1 0 : Counts external signal's falling
and rising edges
1 1 : Inhibited
b3 b2
Notes 1: Valid only when input from the TB0IN pin is selected as the event clock.
If timer's overflow is selected, this bit can be “0” or “1”.
2: Timer B0.
3: Timer B1, timer B2.
4: Set the corresponding port direction register to “0”.
Invalid in event counter mode.
Can be “0” or “1”.
Event clock select
0 : Input from TB0IN pin (Note 4)
1 : TBj overflow
(j = i – 1; however, j = 2 when i = 0)
0 (Fixed to “0” in event counter mode; i = 0)
(Note 2)
(Note 3)
Invalid in timer mode.
In an attempt to write to this bit, write “0.” The value, if read in
event counter mode, turns out to be indeterminate.
Nothing is assigned (i = 1, 2).
In an attempt to write to this bit, write “0.” The value, if read, turns out to
be indeterminate.


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