MC68HC908GR16 Datasheet, PDF (187/310 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Enhanced Serial Communications Interface (ESCI) Module
I/O Registers
SCR2–SCR0 — ESCI Baud Rate Select Bits
These read/write bits select the ESCI baud rate divisor as shown in Table 14-9.
Reset clears SCR2–SCR0.
Table 14-9. 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
14.8.8 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.
Address:
Read:
Write:
Reset:
$0009
Bit 7
6
5
4
3
2
1
PDS2
PDS1
PDS0 PSSB4 PSSB3 PSSB2 PSSB1
0
0
0
0
0
0
0
Figure 14-18. ESCI Prescaler Register (SCPSC)
Bit 0
PSSB0
0
NOTE:
PDS2–PDS0 — Prescaler Divisor Select Bits
These read/write bits select the prescaler divisor as shown in
Table 14-10. Reset clears PDS2–PDS0.
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.
MC68HC908GR16 — Rev. 1.0
MOTOROLA
Enhanced Serial Communications Interface (ESCI) Module
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Data Sheet
187