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Programming Model
14.4.6
UART 1 Non-Integer Prescaler Register
The UART 1 non-integer prescaler register (NIPR1) contains the control bits for the non-integer prescaler.
The bit position assignments for this register are shown in the following register display. The settings for
this register are described in Table 14-9.
NIPR1
BIT 15
14
PRE
SEL
TYPE
rw
0
0
RESET
Table 14-9. UART 1 Non-Integer Prescaler Register Description
Name
PRESEL
Prescaler Selection—This bit selects
Bit 15
the input to the baud rate generator
divider. Refer to Figure 14-4 on
page 14-7 for information about select-
ing the prescaler.
Reserved
Reserved
Bits 14–11
SELECT
Tap Selection—This field selects a tap
Bits 10–8
from the non-integer divider.
STEP
Step Value—This field selects the
VALUE
non-integer prescaler's step value.
Bits 7–0
14-18
UART 1 Non-Integer Prescaler Register
13
12
11
10
SELECT
rw
0
0
0
0
Description
MC68VZ328 User's Manual
9
8
7
6
5
rw
rw
rw
rw
rw
0
0
0
0
0
0x0000
0 = Divider source is from the integer prescaler.
1 = Divider source is from the non-integer prescaler.
These bits are reserved and should be set to 0.
000 = Divide range is 2 to 3 127/128 in 1/128 steps.
001 = Divide range is 4 to 7 63/64 in 1/64 steps.
010 = Divide range is 8 to 15 31/32 in 1/32 steps.
011 = Divide range is 16 to 31 15/16 in 1/16 steps.
100 = Divide range is 32 to 63 7/8 in 1/8 steps.
101 = Divide range is 64 to 127 3/4 in 1/4 steps.
110 = Divide range is 128 to 255 1/2 in 1/2 steps.
111 = Disable the non-integer prescaler.
0000 0000. Step = 0.
0000 0001. Step = 1.
.
.
.
1111 1110. Step = 254.
1111 1111. Step = 255.
0x(FF)FFF90A
4
3
2
1
STEP VALUE
rw
rw
rw
rw
0
0
0
0
Setting
BIT 0
rw
0
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