HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 274

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

14.3 Operation
14.3.1 Overview
The SCI supports serial data transfer in both asynchronous and synchronous modes.
The communication format depends on settings in the SMR as indicated in table 14-5. The clock
source and usage of the SCK pin depend on settings in the SMR and SCR as indicated in table 14-6.
Table 14-5 Communication Formats Used by SCI
C/A
0
1
Table 14-6 SCI Clock Source Selection
SMR
C/A
0
(Async
mode)
1
(Sync
mode)
* Cannot be used by the SCI.
Transmitting and receiving operations in the two modes are described next.
CHR
0
1
—
CKE1
0
1
0
1
SMR
SCR
PE
0
1
0
1
—
CKE0
0
1
0
1
0
1
0
1
STOP
0
1
0
1
0
1
0
1
—
Clock
Source
Internal
External
Internal
External
Mode
Asynchronous
Synchronous
SCK Pin
I/O port*
Clock output at same frequency as baud rate
Clock input at 16 times the baud rate frequency
Serial clock output
Serial clock input
259
Format
8-Bit data
7-Bit data
8-Bit data
Parity
None
Yes
None
Yes
—
Stop Bit
Length
1
2
1
2
1
2
1
2
—