W741E20X Datasheet, PDF (27/84 Pages) Winbond – 4-BIT FLASH MICROCONTROLLER

Preliminary W741E20X
Event Flag (EVF)
The event flag is organized as a 8-bit binary register (EVF0 to EVF7). It is set by hardware and reset by
CLR EVF, #I instruction or the occurrence of an interrupt. The bit descriptions are as follows:
76543210
EVF R R R R
RRR
Note: R means read only.
EVF.0 = 1 Overflow from Divider 0 occurred.
EVF.1 = 1 Underflow from Timer 0 occurred.
EVF.2 = 1 Signal change at port RC occurred.
EVF.3 is reserved.
EVF.4 = 1 Falling edge signal at the INT pin occurred.
EVF.5 = 1 The serial port received completely.
EVF.6 = 1 The serial port transmitted completely.
EVF.7 = 1 Underflow from Timer 1 occurred.
Reset Function
The W741E20X is reset either by a power-on reset or by using the external RES pin. The initial state
of the W741C200 after the reset function is executed is described below.
Program Counter (PC)
TM0, TM1
MR0, MR1, PAGE registers
PSR0, PSR2, PM3 registers
IEF, HEF, HCF, PEF, EVF, SEF flags
Timer 0 input clock
Timer 1 input clock
MFP output
Input/output ports RA, RB
Input/output ports RC, RD
Output port RE
RA and RB ports output type
Input clock of the watchdog timer
000H
Reset
Reset
Reset
Reset
Fosc/4
Fosc
Low
Input mode
Input mode
High
CMOS type
Fosc/1024
- 27 -
Publication Release Date: March 1998
Revision A1