W741E20X Datasheet, PDF (10/84 Pages) Winbond – 4-BIT FLASH MICROCONTROLLER

Preliminary W741E20X
Fosc
Divider0
... Q1 Q2
Q9 Q10 Q11 Q12 Q13 Q14
RRRR
S
EVF.0
Q
R
HEF.0
IEF.0
Hold mode release (HCF.0)
Divider0 interrupt (INT0)
PMF.3
Fosc/16384
Fosc/1024
Enable
/Disable
Mask Option
1. Reset
2. CLR EVF, #01H
3. CLR DIVR0
WDT
Qw1 Qw2 Qw3 Qw4
R
R
R
R
Overflow signal
System Reset
1. Reset
2. CLR WDT
Figure 4. Organization of Divider and Watchdog Timer
Parameter Flag (PMF)
The parameter flag is organized as a 4-bit binary register (PMF.0 to PMF.3). The PMF is controlled by
the SET PMF, #I or CLR PMF, #I instruction. The bit descriptions are as follows:
3210
PMF W
Note: W means write only.
Bit 0, Bit 1 & Bit 2 are reserved.
Bit 3 = 0 The fundamental frequency of the watch dog timer is Fosc/1024.
= 1 The fundamental frequency of the watch dog timer is Fosc/16384.
At initial reset, bit 3 of PMF is set to "0".
- 10 -