Z8F1680SH020SG Datasheet, PDF (309/412 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F1680 Series
Product Specification
284
21.2.4.3. Trim Bit Address 0003H
The Trim Option Bits Register at address 0003H, shown in Table 149, governs control of
the Voltage Brown-Out and Low Voltage Detect trim bits.
Table 149. Trim Option Bits at Address 0003H (TLVD_VBO)
Bits
7
6
5
4
3
2
1
0
Field
VBO_TRIM
LVD_TRIM
Reset
U
U
U
U
U
U
U
U
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Address
Information Page Memory 0023H
Note: U = Unchanged by Reset. R/W = Read/Write.
Bit
[7:4]
VBO_TRIM
[3:0]
LVD_TRIM
Description
Reserved
These bits are reserved and must be programmed to 0000.
Low Voltage Detect Trim
This trimming affects the low-voltage detection threshold. Each LSB represents a
50 mV change in the threshold level. Alternatively, the low voltage threshold can be
computed from the options bit value by the following equation:
LVD_LVL = 3.2 V – LVD_TRIM * 0.05 V
Typical LVD_TRIM values are listed in Table 150.
LVD_TRIM
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
Table 150. LVD_Trim Values
LVD Threshold (V)
Minimum
Typical
3.20
3.15
3.10
3.05
3.00
2.95
2.90
Maximum Description
Maximum LVD threshold
2.85
2.80
2.75
2.70
2.65
2.60
PS025015-1212
PRELIMINARY
Flash Option Bits