HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 199

• Manufacturer Part Number: HD6433308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

Bit 4 – Receive Enable (RE): This bit enables or disables the receive function. When the receive
function is enabled, the ARxD or CRxD pin is automatically used for input. When the receive
function is disabled, the ARxD or CRxD pin is available as a general-purpose I/O port.
Bit 4
RE
Bits 3 and 2 – Reserved: These bits cannot be modified and are always read as “1.”
Bit 1 – Clock Enable 1 (CKE1): This bit selects the internal or external clock source for the baud
rate generator. When the external clock source is selected, the ASCK or CSCK pin is automatically
used for input of the external clock signal.
Bit 1
CKE1
Bit 0 – Clock Enable 0 (CKE0): When an internal clock source is used in asynchronous mode,
this bit enables or disables serial clock output at the ASCK pin.
This bit is ignored when the external clock is selected, or when the synchronous mode is selected.
Bit 0
CKE0
For further information on clock source selection, see Table 9-6 in Section 9.3, “Operation.”
0
1
0
1
0
1
Description
The receive function is disabled. The ARxD and CRxD pins can be
used for general-purpose I/O.
The receive function is enabled. When C/A = 0, the ARxD pin is used
for input. When C/A = 1, the CRxD pin is used for input.
Description
Internal clock source. (When C/A = 1, the CSCK pin is used
External clock source. (When C/A = 1, the CSCK pin is used
for input. When C/A = 0, the ASCK pin is used for input.)
Description
The ASCK pin is not used by the SCI (and is available as
a general-purpose I/O port).
The ASCK pin is used for serial clock output.
for output.)
186
(Initial value)
(Initial value)
(Initial value)