MC908QY8CDWE Datasheet, PDF (133/232 Pages) Freescale Semiconductor, Inc – Addendum to MC68HC908QB8, rev. 3

Registers
SCP1 and SCP0 — ESCI Baud Rate Register Prescaler Bits
These read/write bits select the baud rate register prescaler divisor as shown in Table 13-6.
Table 13-6. ESCI Baud Rate Prescaling
SCP[1:0]
00
01
10
11
Baud Rate Register
Prescaler Divisor (BPD)
1
3
4
13
SCR2–SCR0 — ESCI Baud Rate Select Bits
These read/write bits select the ESCI baud rate divisor as shown in Table 13-7. Reset clears
SCR2–SCR0.
Table 13-7. ESCI Baud Rate Selection
SCR[2:1:0]
000
001
010
011
100
101
110
111
Baud Rate Divisor (BD)
1
2
4
8
16
32
64
128
13.8.8 ESCI Prescaler Register
The ESCI prescaler register (SCPSC) together with the ESCI baud rate register selects the baud rate for
both the receiver and the transmitter.
NOTE
There are two prescalers available to adjust the baud rate — one in the
ESCI baud rate register and one in the ESCI prescaler register.
Read:
Write:
Reset:
Bit 7
6
5
4
3
2
1
PDS2
PDS1
PDS0 PSSB4 PSSB3 PSSB2 PSSB1
0
0
0
0
0
0
0
Figure 13-17. ESCI Prescaler Register (SCPSC)
Bit 0
PSSB0
0
MC68HC908QB8 Data Sheet, Rev. 3
Freescale Semiconductor
131