W741C205 Просмотр технического описания (PDF) - Winbond

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W741C205

4-BIT MICROCONTROLLER

Winbond 

Preliminary W741C20X

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)

Fosc/16384 PMF.3

Fosc/1024

Enable

/Disable

Mask Option

1. Reset

2. CLR EVF, #01H

3. CLR DIVR0

WDT

Qw1 Qw2 Qw3 Qw4 Overflow signal

R

R

R

R

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".

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