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参数资料
| 型号： | M306N5FCTGP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100 |
| 文件页数： | 45/63页 |
| 文件大小： | 825K |
| 代理商： | M306N5FCTGP |
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Timer A1
Mitsubishi microcomputers
M16C / 62A Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
74
Item
Specification
Count source
External signals input to TAiIN pin (effective edge can be selected by software)
TB2 overflow, TAj overflow
Count operation
Up count or down count can be selected by external signal or software
When the timer overflows or underflows, it reloads the reload register con
tents before continuing counting (Note)
Divide ratio
1/ (FFFF16 - n + 1) for up count
1/ (n + 1) for down count
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 overflows or underflows
TAiIN pin function
Programmable I/O port or count source input
TAiOUT pin function
Programmable I/O port, pulse output, or up/down count select input
Read from timer
Count value can be read out by reading timer Ai register
Write to timer
When counting stopped
When a value is written to timer Ai register, it is written to both reload register and counter
When counting in progress
When a value is written to timer Ai register, it is written to only reload register
(Transferred to counter at next reload time)
Select function
Free-run count function
Even when the timer overflows or underflows, the reload register content is not reloaded to it
Pulse output function
Each time the timer overflows or underflows, the TAiOUT pin’s polarity is reversed
Note 1: This does not apply when the free-run function is selected.
Note 2: Timer A1 and A2 do not have I/O port (TAiIN and TAiOUT).
(2) Event counter mode
In this mode, the timer counts an external signal or an internal timer’s overflow. Timers A0 and A1 can
count a single-phase external signal. Timers A2, A3, and A4 can count a single-phase and a two-phase
external signal. Table 1.13.2 lists timer specifications when counting a single-phase external signal.
Figure 1.13.8 shows the timer Ai mode register in event counter mode.
Table 1.13.3 lists timer specifications when counting a two-phase external signal. Figure 1.13.9 shows
the timer Ai mode register in event counter mode.
Table 1.13.2. Timer specifications in event counter mode (when not processing two-phase pulse signal)
Figure 1.13.8. Timer Ai mode register in event counter mode
Timer Ai mode register
Note 1: In event counter mode, the count source is selected by the event / trigger select bit
(addresses 038216 and 038316).
Note 2: The settings of the corresponding port register and port direction register are invalid.
Note 3: Valid only when counting an external signal.
Note 4: When an “L” signal is input to the TAiOUT pin, the downcount is activated. When “H”,
the upcount is activated. Set the corresponding port direction register to “0”.
Note 5: Set these bits "0" in timer A1 and A2 mode registers.
Symbol
Address
When reset
TAiMR(i = 0, 1)
039616, 039716
0016
W
R
b7
b6
b5
b4
b3
b2
b1
b0
Operation mode select bit
0 1 : Event counter mode (Note 1)
b1 b0
TMOD0
MR0
Pulse output function
select bit
0 : Pulse is not output
(TAiOUT pin is a normal port pin)
1 : Pulse is output (Note 2)
(TAiOUT pin is a pulse output pin)
Count polarity
select bit (Note 3,5)
MR2
MR1
MR3
0 (Must always be fixed to “0” in event counter mode)
TCK0
Count operation type
select bit
01
0
0 : Counts external signal's falling edge
1 : Counts external signal's rising edge
Up/down switching
cause select bit
0 : Up/down flag's content
1 : TAiOUT pin's input signal (Note 4)
0 : Reload type
1 : Free-run type
Bit symbol
Bit name
Function
RW
TCK1
Invalid in event counter mode
Can be “0” or “1”
TMOD1
(Note 5)
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