H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 592
H8S-2350
Manufacturer Part Number
H8S-2350
Description
16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.H8S-2350.pdf
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Section 13 Serial Communication Interface (SCI)
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 clocked synchronous mode, and in the case
of external clock operation (CKE1 = 1). Note that the SCI’s operating mode must be decided using
SMR before setting the CKE1 and CKE0 bits.
For details of clock source selection, see table 13.9.
Notes: 1. Initial value
Rev. 3.00 Sep 15, 2006 page 558 of 988
REJ09B0330-0300
Bit 1
CKE1
0
1
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
Description
Asynchronous mode
Clocked synchronous
mode
Asynchronous mode
Clocked synchronous
mode
Asynchronous mode
Clocked synchronous
mode
Asynchronous mode
Clocked 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
3
3
2
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