Z51F3220FNX Datasheet, PDF (287/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
LVRCR (Low Voltage Reset Control Register) : D8H
7
6
5
4
LVRST
–
–
LVRVS3
R/W
–
–
R/W
3
LVRVS2
R/W
2
LVRVS1
R/W
1
0
LVRVS0
LVREN
R/W
R/W
Initial value : 00H
LVRST
LVRVS[3:0]
LVREN
LVR Enable when Stop Release
0
Not effect at stop release
1
LVR enable at stop release
NOTES)
When this bit is ‘1’, the LVREN bit is cleared to ‘0’ by stop mode to
release. (LVR enable)
When this bit is ‘0’, the LVREN bit is not effect by stop mode to
release.
LVR Voltage Select
LVRVS3 LVRVS2 LVRVS1 LVRVS0 Description
0
0
0
0
1.60V
0
0
0
1
2.00V
0
0
1
0
2.10V
0
0
1
1
2.20V
0
1
0
0
2.32V
0
1
0
1
2.44V
0
1
1
0
2.59V
0
1
1
1
2.75V
1
0
0
0
2.93V
1
0
0
1
3.14V
1
0
1
0
3.38V
1
0
1
1
3.67V
1
1
0
0
4.00V
1
1
0
1
4.40V
1
1
1
0
Not available
1
1
1
1
Not available
LVR Operation
0
LVR Enable
1
LVR Disable
NOTES) 1. The LVRVS[3:0] bits are cleared by a power-on reset but are retained by other reset signals.
2. The LVRVS[3:0] bits should be set to ‘0000b’ while LVREN bit is “1”.
PS029902-0212
PRELIMINARY
285