PD17225_15 Datasheet, PDF (39/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
6. BASIC INTERVAL TIMER/WATCHDOG TIMER
The basic interval timer has a function to generate the interval timer interrupt signal and watchdog timer reset signal.
6.1 Source Clock for Basic Interval Timer
The system clock (fX) is divided, to generate the source clock for the basic interval timer. The input clock frequency
for the basic interval timer is fX/2⁷. When the CPU is set in the STOP mode, the basic interval timer also stops.
6.2 Controlling Basic Interval Timer
The basic interval timer is controlled by the bits on the register file. That is, the basic interval timer is reset by BTMRES.
The frequency for the interrupt signal, output by the basic interval timer, is selected by BTMMD, and the watchdog timer
is reset by WDTRES.
Figure 6-1. Basic Interval Timer Configuration
System
clock fX
1/2 ⁷
divider
1/2 ¹¹
divider
1/2
divider
1/2
divider
fX /2 ¹⁸
fX /2 ²⁰
1/2
divider
WDOUT
BTMRES
WDTRES BTMCK IRQBTM
Data Sheet U12643EJ2V0DS00
37