s908gr32ag3vfa Freescale Semiconductor, Inc, s908gr32ag3vfa Datasheet - Page 176
s908gr32ag3vfa
Manufacturer Part Number
s908gr32ag3vfa
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
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Enhanced Serial Communications Interface (ESCI) Module
PDS2–PDS0 — Prescaler Divisor Select Bits
PSSB4–PSSB0 — Clock Insertion Select Bits
176
These read/write bits select the prescaler divisor as shown in
These read/write bits select the number of clocks inserted in each 32 output cycle frame to achieve
more timing resolution on the average prescaler frequency as shown in
PSSB4–PSSB0.
The setting of ‘000’ will bypass this prescaler. It is not recommended to
bypass the prescaler while ENSCI is set, because the switching is not glitch
free.
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
PSSB[4:3:2:1:0]
0 0 0 0 0
0 0 0 0 1
0 0 0 1 0
0 0 0 1 1
0 0 1 0 0
0 0 1 0 1
0 0 1 1 0
0 0 1 1 1
0 1 0 0 0
0 1 0 0 1
0 1 0 1 0
0 1 0 1 1
0 1 1 0 0
0 1 1 0 1
0 1 1 1 0
0 1 1 1 1
Table 13-10. ESCI Prescaler Divisor Fine Adjust
PDS[2:1:0]
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Table 13-9. ESCI Prescaler Division Ratio
0/32 = 0
1/32 = 0.03125
2/32 = 0.0625
3/32 = 0.09375
4/32 = 0.125
5/32 = 0.15625
6/32 = 0.1875
7/32 = 0.21875
8/32 = 0.25
9/32 = 0.28125
10/32 = 0.3125
11/32 = 0.34375
12/32 = 0.375
13/32 = 0.40625
14/32 = 0.4375
15/32 = 0.46875
Prescaler Divisor Fine Adjust (PDFA)
NOTE
Prescaler Divisor (PD)
Bypass this prescaler
2
3
4
5
6
7
8
Continued on next page
Table
13-9. Reset clears PDS2–PDS0.
Table
13-10. Reset clears
Freescale Semiconductor
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