Samsung KS57C2308 manual Basic Timer Register Overview Type Description Size, Ram, Wdtcf

KS57C2308/P2308/C2316/P2316TIMERS and TIMER/COUNTERS

Table 11-1. Basic Timer Register Overview

Register	Type	Description	Size	RAM	Addressing	Reset
Name				Address	Mode	Value
BMOD	Control	Controls the clock frequency	4-bit	F85H	4-bit write-only;	“0”
		(mode) of the basic timer; also, the			BMOD.3: 1-bit
		oscillation stabilization interval after			write-only
		power-down mode release or RESET
BCNT	Counter	Counts clock pulses matching the	8-bit	F86H–F87H	8-bit read-	“U”
		BMOD frequency setting			only	(note)
WDMOD	Control	Controls watchdog timer operation.	8-bit	F98H–F99H	8-bit write-only	A5H
WDTCF	Control	Clear the watchdog timer’s counter.	1-bit	F9AH.3	1-bit write-only	“0”

NOTE: “U”means that the value is undetermined after a RESET.

"Clear" Signal

Bits

Instruction

4

						Clear				Clear
BMOD.3					BCNT					IRQB
											Interrupt
BMOD.2
		Clock	BCNT				Overflow		IRQB		Request
		Selector
BMOD.1								Bit5			1-Bit R/W
BMOD.0
									CPU Clock Start Signals
				8
									(By Interrupts)
									(By RESET )
		Clock Input
	1 pulse period = BT input clock 28 (1/2 duty)
		3-Bit Counter

WDMOD

8

WAIT

Overflow	Reset	RESET
WDTCNT	Generation
C

WDTCF DELAY

Stop Clear

RESET	Bits	NOTE: WAIT means stabilization time
	Instruction	after RESET or Stabilization
		time after STOP mode release.

Figure 11-1. Basic Timer Circuit Diagram

11-3