Rev. 2.0, 11/00, page 983 of 1037
H'D14A: Serial Control Register SCR1: SCI1
7
TIE
0
R/W
6
RIE
0
R/W
5
TE
0
R/W
4
RE
0
R/W
3
MPIE
0
R/W
0
CKE0
0
R/W
2
TEIE
0
R/W
1
CKE1
0
R/W
Transmit-data-empty interrupt (TXI) request is disabled
*
Transmit-data-empty interrupt (TXI) request is enabled
0
1
Transmit interrupt enable bit
Note:
*
TXI interrupt request cancellation can be performed by reading 1 from the TDRE flag, then clearing it to 0,
or clearing the TIE bit to 0.
Reveive-data-full interrupt (RXI) request and receive-error interrupt (ERI) request is disabled
*
Reveive-data-full interrupt (RXI) request and receive-error interrupt (ERI) request is enabled
0
1
Receive interrupt enable bit
Note:
*
RXI and ERI interrupt request cancellation can be performed by reading 1 from the RDRF, FER, PER, or ORER flag,
then clearing the flag to 0, or clearing the RIE bit to 0.
Transmission is disabled
*
1
Transmission is enabled
*
2
0
1
Transmit enable bit
Notes: 1. The TDRE flag in SSR1 is fixed at 1.
2. In this state, serial transmission is started when transmit data is written to TDR and TDRE flag in SSR1
is cleared to 0.
SMR1 setting must be performed to decide the transmission format before setting the TE bit to 1.
Reception is disabled
*
1
Reception is enabled
*
2
0
1
Receive enable bit
Notes: 1. Clearing the RE bit to 0 does not affect the RDRF, FER, PER, and ORER flags, which retain their states.
2. Serial reception is started in this state when a start bit is detected in asynchronous mode or serial
clock input is detected in synchronous mode.
SMR1 setting must be performed to decide the reception format before setting the RE bit to 1.
Multiprocessor interrupts are disabled (normal reception performed)
[Clearing conditions]
(1) When the MPIE bit is cleared to 0
(2) When data with MPB = 1 is received
Multiprocessor interrupt are enabled
*
Receive interrupt (RXI) requests, receive-error interrupt (ERI) requests, and setting of the RDRF,
FER, and ORER flags in SSR1 are disabled until data with the multiprocessor bit set to 1 is received.
0
1
Multiprocessor interrupt enable bit
Note:
*
When receive data including MPB = 0 is reveived, receive data transfer from RSR to RDR1, receive error detection, and
setting of the RDRF, FER, and ORER flags in SSR1, is not performed. When receive data with MPB = 1 is received,
the MPB bit in SSR1 is set to 1, the MPIE bit is cleared to 0 automatically, and generation of RXI and ERI interrupts
(when the TIE and RIE bits in SCR1 are set to 1) and FER and ORER flag setting is enabled.
Clock enable bits
Notes: 1. Initial value
2. Outputs a clock of the same frequency as the bit rate.
3. Inputs a clock with a frequency 16 times the bit rate.
Clock select
0
0
Internal clock/SCK1 pin function as I/O port
*
1
CKE0
CKE1
Internal clock/SCK1 pin function as serial clock output
*
1
1
Internal clock/SCK1 pin function as clock output
*
2
Internal clock/SCK1 pin function as serial clock output
0
1
External clock/SCK1 pin function as clock input
*
3
External clock/SCK1 pin function as serial clock input
1
External clock/SCK1 pin function as clock input
*
3
Start-stop synchronous mode
Clock synchronous mode
Start-stop synchronous mode
Clock synchronous mode
Start-stop synchronous mode
Clock synchronous mode
Start-stop synchronous mode
Clock synchronous mode
External clock/SCK1 pin function as serial clock input
Transmit-end interrupt (TEI) request is disabled
*
Transmit-end interrupt (TEI) request is enabled
*
0
1
Transmit end interrupt enable bit
Note:
*
TEI cancellation can be performed by reading 1 from the TDRE flag in SSR, then clearing it
to 0 and clearing the TEND flag to 0, or clearing the TEIE bit to 0.
Bit :
Initial value :
R/W :
Summary of Contents for Hitachi H8S/2191
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