Z51F3220FNX Datasheet, PDF (113/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
WTCR (Watch Timer Control Register) : 96H
7
6
5
4
WTEN
–
–
WTIFR
R/W
–
–
R/W
3
WTIN1
R/W
2
WTIN0
R/W
1
0
WTCK1
WTCK0
R/W
R/W
Initial value : 00H
WTEN
Control Watch Timer
0
Disable
1
Enable
WTIFR
When WT Interrupt occurs, this bit becomes ‘1’. For clearing bit,
write ‘0’ to this bit or automatically clear by INT_ACK signal.
0
WT Interrupt no generation
1
WT Interrupt generation
WTIN[1:0]
Determine interrupt interval
WTIN1 WTIN0 Description
WTCK[1:0]
0
0
fWCK/2^7
0
1
fWCK/2^13
1
0
fWCK/2^14
1
1
fWCK/(2^14 x (7bit WTDR Value+1))
Determine Source Clock
WTCK1 WTCK0 Description
0
0
fSUB
0
1
fX/256
1
0
fX/128
1
1
fX/64
NOTE)
fX – System clock frequency (Where fx= 4.19MHz)
fSUB – Sub clock oscillator frequency (32.768kHz)
fWCK – Selected Watch timer clock
fLCD – LCD frequency (Where fX= 4.19MHz, WTCK[1:0]=’10’; fLCD= 1024Hz)
PS029902-0212
PRELIMINARY
110