參數(shù)資料
型號(hào)： M306H7MC-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁(yè)數(shù)： 88/115頁(yè)
文件大?。?/td> 3146K
代理商： M306H7MC-XXXFP
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Rev.2.10
Oct 25, 2006
Page 74 of 326
REJ03B0152-0210
M306H7MG-XXXFP/MC-XXXFP/FGFP
9.TIMERS
9.1
Timer A
Figure 9.3 shows a block diagram of the timer A. Figures 9.4 to 9.6 show registers related to the timer A.
The timer A supports the following four modes. Except in event counter mode, timers A0 to A4 all have the same
function. Use the TMOD1 to TMOD0 bits of TAiMR register (i = 0 to 4) to select the desired mode.
Timer mode: The timer counts an internal count source.
Event counter mode: The timer counts pulses from an external device or overflows and underflows of other
timers.
One-shot timer mode: The timer outputs a pulse only once before it reaches the minimum count “000016.”
Pulse width modulation (PWM) mode: The timer outputs pulses in a given width successively.
Figure 9.3
Timer A Block Diagram
Figure 9.4
TA0MR to TA4MR Registers
TABSR register
Up-count/down-count
TAi
Addresses
TAj
TAk
Timer A0
038716
038616
Timer A4
Timer A1
038916
038816
Timer A0
Timer A2
038B16
038A16
Timer A1
Timer A3
038D16
038C16
Timer A2
Timer A4
038F16
038E16
Timer A3
Timer A0
Always counts down except
in event counter mode
Reload register
Counter
Low-order
8 bits
High-order
8 bits
Clock source
selection
Timer
(gate function)
Timer
One shot
PWM
f1 or f2
f8
f32
TAiIN
(i = 0 to 4)
TB2 overflow
Event counter
fC32
Clock selection
TAj overflow
(j = i – 1. Note, however, that j = 4 when i = 0)
Pulse output
Toggle flip-flop
TAiOUT
(i = 0 to 4)
Data bus low-order bits
Data bus high-order bits
UDF register
Down count
TAk overflow
(k = i + 1. Note, however, that k = 0 when i = 4)
Polarity
selection
To external
trigger circuit
(Note)
Note: Overflow or underflow
Clock selection
Timer Ai mode register (i=0 to 4)
Symbol
Address
After reset
TA0MR to TA4MR
039616 to 039A16
0016
Bit name
Function
Bit symbol
RW
b7
b6
b5
b4
b3
b2
b1
b0
0 0 : Timer mode
0 1 : Event counter mode
1 0 : One-shot timer mode
1 1 : Pulse width modulation
(PWM) mode
b1 b0
TCK1
MR3
MR2
MR1
TMOD1
MR0
TMOD0
TCK0
Function varies with each
operation mode
Count source select bit
Operation mode select bit
RW
Function varies with each
operation mode
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