Watch Timer Configuration; Watch Timer Control Registers - NEC PD78052 User Manual

10.2 Watch Timer Configuration

The watch timer consists of the following hardware.
Counter
Control register

10.3 Watch Timer Control Registers

The following two types of registers are used to control the watch timer.
• Timer clock select register 2 (TCL2)
• Watch timer mode control register (TMC2)
(1) Timer clock select register 2 (TCL2) (Refer to Figure 10-2.)
This register sets the watch timer count clock.
TCL2 is set with an 8-bit memory manipulation instruction.
RESET input sets TCL2 to 00H.
Remark Besides setting the watch timer count clock, TCL2 sets the watchdog timer count clock and buzzer
output frequency.
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CHAPTER 10 WATCH TIMER
Table 10-2. Watch Timer Configuration
Item
5 bits 1
Timer clock select register 2 (TCL2)
Watch timer mode control register (TMC2)
Configuration