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M30201 Fiches technique(PDF) 56 Page - Mitsubishi Electric Semiconductor |
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M30201 Fiches technique(HTML) 56 Page - Mitsubishi Electric Semiconductor |
56 / 159 page Mitsubishi microcomputers M30201 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Timer A 56 Item Specification Count source f1, f8, f32, fC32 Count operation • The timer counts down • When the count reaches 000016, the timer stops counting after reloading a new count • If a trigger occurs when counting, the timer reloads a new count and restarts counting Divide ratio 1/n n : Set value Count start condition • An external trigger is input • The timer overflows • The one-shot start flag is set (= 1) Count stop condition • A new count is reloaded after the count has reached 000016 • The count start flag is reset (= 0) Interrupt request generation timing The count reaches 000016 TA0IN pin function Programmable I/O port or trigger input TA0OUT pin function Programmable I/O port or pulse output Read from timer When timer A0 register is read, it indicates an indeterminate value Write to timer • When counting stopped When a value is written to timer A0 register, it is written to both reload register and counter • When counting in progress When a value is written to timer A0 register, it is written to only reload register (Transferred to counter at next reload time) Table 1.16. Timer specifications in one-shot timer mode Figure 1.44. Timer A0 mode register in one-shot timer mode (3) One-shot timer mode In this mode, the timer operates only once. (See Table 1.16.) When a trigger occurs, the timer starts up and continues operating for a given period. Figure 1.44 shows the timer A0 mode register in one-shot timer mode. Bit name Function Bit symbol Operation mode select bit 1 0 : One-shot timer mode b1 b0 TMOD1 TMOD0 MR0 Pulse output function select bit 0 : Pulse is not output (TA0OUT pin is a normal port pin) 1 : Pulse is output (Note 1) (TA0OUT pin is a pulse output pin) MR2 MR1 MR3 0 (Must always be “0” in one-shot timer mode) 0 0 : f1 0 1 : f8 1 0 : f32 1 1 : fC32 b7 b6 TCK1 TCK0 Count source select bit 10 0 0 : One-shot start flag is valid 1 : Selected by event/trigger select register Trigger select bit External trigger select bit (Note 2) 0 : Falling edge of TA0IN pin's input signal (Note 3) 1 : Rising edge of TA0IN pin's input signal (Note 3) W R Note 1: Set the corresponding port direction register to “1” (output mode). Note 2: Valid only when the TA0IN pin is selected by the event/trigger select bit (addresses 038316). If timer overflow is selected, this bit can be “1” or “0”. Note 3: Set the corresponding port direction register to “0” (input mode). Timer A0 mode register Symbol Address When reset TA0MR 039616 0016 b7 b6 b5 b4 b3 b2 b1 b0 |
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