PD17012_15 Datasheet, PDF (130/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
12.3 Basic Timer 1
12.3.1 General
Figure 12-11 illustrates basic timer 1.
Basic timer 1 issues an interrupt request at a fixed time interval and sets the IRQBTM1 flag to 1.
The interrupt generated by basic timer 1 is acknowledged when the IRQBTM1 flag is set, if the EI instruction has
been issued and the IPBTM1 flag has been set (refer to 11. INTERRUPTS).
Figure 12-11. Outline of Basic Timer 1
Clock select block
BTM1CK1 flag
BTM1CK0 flag
4.5 MHz
Divider
Selector
IRQBTM1 set signal
Remark BTM1CK1 and BTM1CK0 (bits 3 and 2 of the basic timer clock select register, refer to Figure 12-3) set
the time interval at which the IRQBTM1 flag is set.
12.3.2 Clock select block
The clock select block divides the system clock (4.5 MHz) and sets the time interval at which the IRQBTM1 flag
is to be set, by using the basic timer clock select register.
For the configuration and function of the basic timer clock select register, refer to Figure 12-3.
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Data Sheet U10101EJ4V0DS