W79E217A Datasheet, PDF (48/207 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E217A Data Sheet
TIMER 3 CONTROL
Bit:
7
6
5
4
3
2
1
0
TF3
-
-
-
-
TR3
-
CMP / RL3
Mnemonic: T3CON
Address: C3h
BIT NAME
FUNCTION
7 TF3
Timer 3 overflows flag. This bit is set when Timer 3 overflows. It is cleared only
by software and set by hardware.
6-3 -
Reserved.
2 TR3
Timer 3 Run Control. This bit enables/disables the operation of timer 3. Halting
this will preserve the current count in TH3, TL3.
1-
Reserved.
Compare/Reload Select. This bit determines whether the Timer 3 will be use for
0
compare or reload function.
CMP / RL3
0 = Timer 3 as reload mode, TF3 indicates the overflow flag
1 = Timer 3 as compare mode, TF3 indicates the compare match flag.
POWER MANAGEMENT REGISTER
Bit:
7
6
5
4
3
2
1
0
-
-
-
-
-
ALEOFF -
DME0
Mnemonic: PMR
Address: C4h
BIT NAME
FUNCTION
7-3 -
Reserved.
This bit disables the expression of the ALE signal on the device pin during all on
2
ALEOFF
board program and data memory accesses. External memory accesses will
automatically enable ALE independent of ALEOFF. ALEOFF=0: ALE expression
is enabled. ALEOFF=1: ALE expression is disabled.
1-
Reserved.
0 DME0
This bit determines the on chip MOVX SRAM to be enabled or disabled. Set this
bit to 1 will enable the on chip 2 KB MOVX SRAM.
FAULT SAMPLING TIME REGISTER
Bit:
7
6
5
SCMP1
SCMP0
SFP1
Mnemonic: FSPLT
4
SFP0
3
SFCEN
2
SFCST
1
0
SFCDIR LSBD
Address: C5h
- 48 -
Publication Release Date: December 14, 2007
Revision A3.0