UPD17015GS datasheet(44/120 Pages) NEC

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µPD17015

10.2.3 Example of Using Basic Timer 0

A sample program follows. The following program performs process A at every one second.

Example

MEM 0.10H

; 1 second counter

LOOP:

SKT1

BTM0CY

; Branches to NEXT if BTM0CY is 0.

ADD

M1, #0100B

; Adds 4 to M1.

SKT1

; Branches to NEXT if CY flag is 0.

; Performs process A if CY flag is 1.

Process A

Process B

; Performs B and branches to LOOP.

LOOP

10.2.4

Time Interval Error in Basic Timers 0 and 1

The time interval at which the BTM0CY and BTM1CY flags are detected must be shorter than the time interval

at which the BTM0CY and BTM1CY flags are set. (See Section 10.2.5.)

Assuming that the BTM0CY or BTM1CY flag is detected at intervals of tCHECK and set at intervals of tSET (125 or

5 ms, respectively), the relationship between tCHECK and tSET must be as follows:

tCHECK < tSET

Under this condition, the time interval error encountered when the BTM0CY and BTM1CY flags are detected is

as follows:

0 < error < tSET

Fig. 10-4 Basic Timers 0 and 1 Error Related to the Detection Time of the BTM0CY and BTM1CY Flags

tSET

tCHECK1

tCHECK2

tCHECK3

SKT1

BTM0CY

SKT1

BTM1CY

SKT1

BTM0CY

SKT1

BTM1CY

SKT1

BTM0CY

SKT1

BTM1CY

SKT1

BTM0CY

SKT1

BTM1CY

BTM1CY flag set pulse

BTM0CY flag set pulse

BTM1CY flag

BTM0CY flag

UPD17015GS Datasheet(PDF) 44 Page - NEC

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