HD64F3644PV Datasheet, PDF (331/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 10 Serial Communication Interface
Note: The value set in BRR is given by the following equation:
N=
OSC
(8 × 2²ⁿ × B)
× 10⁶ – 1
where
B: Bit rate (bit/s)
N: Baud rate generator BRR setting (0 ≤ N ≤ 255)
OSC: Value of φ_OSC (MHz)
n: Baud rate generator input clock number (n = 0, 1, 2, or 3)
(The relation between n and the clock is shown in table 10.10.)
Table 10.10 Relation between n and Clock
n
Clock
0
φ
1
φ/4
2
φ16
3
φ/64
CKS1
0
0
1
1
SMR Setting
CKS0
0
1
0
1
10.3.3 Operation
SCI3 can perform serial communication in two modes: asynchronous mode in which
synchronization is provided character by character, and synchronous mode in which
synchronization is provided by clock pulses. The serial mode register (SMR) is used to select
asynchronous or synchronous mode and the data transfer format, as shown in table 10.11.
The clock source for SCI3 is determined by bit COM in SMR and bits CKE1 and CKE0 in SCR3,
as shown in table 10.12.
Asynchronous Mode
• Choice of 7- or 8-bit data length
• Choice of parity addition, multiprocessor bit addition, and addition of 1 or 2 stop bits. (The
combination of these parameters determines the data transfer format and the character length.)
• Framing error (FER), parity error (PER), overrun error (OER), and break detection during
reception
Rev. 6.00 Sep 12, 2006 page 309 of 526
REJ09B0326-0600