Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 12 Synchronous Serial Port with FIFO
FEUL620Q504 12–9
12.2.5 SIOF0 Baud Rate Register (SF0BRR)
Address: 0F786H
Access: R/W
Access size: 16 bits
Initial value: 5002H
7 6 5 4 3 2 1 0
- SF0BR7 SF0BR6 SF0BR5 SF0BR4 SF0BR3 SF0BR2 SF0BR1 SF0BR0
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 1 0
15 14 13 12 11 10 9 8
-
SF0LAG1 SF0LAG0 SF0LEAD1 SF0LEAD0
– – SF0BR9 SF0BR8
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value 0 1 0 1 0 0 0 0
SF0BRR is a special function register (SFR) used to set the operation mode.
Do not change the setting of this register during transfer. Operation is not guaranteed if it is changed during
transfer.
Description of Bits
•
SF0BR9-0 (bits 9 to 0)
Sets the baud rate (f
SCK
)(setting enabled in Master mode).
f
SCK
=f
HLSCLK
/(2×SF0BR9-0)
f
HLSCLK
: HSCLK or LSCLK frequency
SF0BR[9:0]
Description
9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0 0 2 dividing
0 0 0 0 0 0 0 0 0 1 2 dividing
0 0 0 0 0 0 0 0 1 0 4 dividing (initial value)
0 0 0 0 0 0 0 0 1 1 6 dividing
: :
1 1 1 1 1 1 1 1 1 1 2046 dividing
[Note]
The maximum SSIOF transfer frequency is 4MHz. This setting should not exceed 4MHz.
If using P22 as SCKF0 in master mode, the max frequency is 2MHz.
•
SF0LEAD1-0 (bits 13 to 12)
SF0LEAD1-0 set the SSF0 –SCKF0 delay interval (setting enabled only in Master mode).
SF0LEAD1 SF0LEAD0 Description
0 0 0.5 X SCK
0 1 0.5 X SCK (initial value)
1 0 1.0 X SCK
1 1 1.5 X SCK