h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 454

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Serial Communication Interface (SCI, IrDA)
Bit 2
TEIE
0
1
Note:
Bits 1 and 0—Clock Enable 1 and 0 (CKE1, CKE0): These bits are used to select the SCI clock
source and enable or disable clock output from the SCK pin. The combination of the CKE1 and
CKE0 bits determines whether the SCK pin functions as an I/O port, the serial clock output pin, or
the serial clock input pin.
The setting of the CKE0 bit, however, is only valid for internal clock operation (CKE1 = 0) in
asynchronous mode. The CKE0 bit setting is invalid in synchronous mode, and in the case of
external clock operation (CKE1 = 1). The setting of bits CKE1 and CKE0 must be carried out
before the SCI’s operating mode is determined using SMR.
For details of clock source selection, see table 15.9 in section 15.3, Operation.
Bit 1
CKE1
0
1
Notes: 1. Initial value
Rev. 4.00 Jun 06, 2006 page 400 of 1004
REJ09B0301-0400
* TEI cancellation can be performed by reading 1 from the TDRE flag in SSR, then
2. Outputs a clock of the same frequency as the bit rate.
3. Inputs a clock with a frequency 16 times the bit rate.
Bit 0
CKE0
0
1
0
1
clearing it to 0 and clearing the TEND flag to 0, or clearing the TEIE bit to 0.
Description
Transmit-end interrupt (TEI) request disabled *
Transmit-end interrupt (TEI) request enabled *
Description
Asynchronous mode
Synchronous mode
Asynchronous mode
Synchronous mode
Asynchronous mode
Synchronous mode
Asynchronous mode
Synchronous mode
Internal clock/SCK pin functions as I/O port *
Internal clock/SCK pin functions as serial clock
output *
Internal clock/SCK pin functions as clock output *
Internal clock/SCK pin functions as serial clock
output
External clock/SCK pin functions as clock input *
External clock/SCK pin functions as serial clock
input
External clock/SCK pin functions as clock input *
External clock/SCK pin functions as serial clock
input
1
(Initial value)
1
3
3
2