Datasheet

I/O Registers
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
Freescale Semiconductor 175
SCP1 and SCP0 — ESCI Baud Rate Register Prescaler Bits
These read/write bits select the baud rate register prescaler divisor as shown in Table 13-7. Reset
clears SCP1 and SCP0.
SCR2–SCR0 — ESCI Baud Rate Select Bits
These read/write bits select the ESCI baud rate divisor as shown in Table 13-8. Reset clears
SCR2–SCR0.
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.
;
Table 13-7. ESCI Baud Rate Prescaling
SCP[1:0]
Baud Rate Register
Prescaler Divisor (BPD)
00 1
01 3
10 4
11 13
Table 13-8. ESCI Baud Rate Selection
SCR[2:1:0] Baud Rate Divisor (BD)
000 1
001 2
010 4
011 8
100 16
101 32
110 64
111 128
Address: $0009
Bit 7654321Bit 0
Read:
PDS2 PDS1 PDS0 PSSB4 PSSB3 PSSB2 PSSB1 PSSB0
Write:
Reset:00000000
Figure 13-18. ESCI Prescaler Register (SCPSC)