HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 389

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

(SMR) before setting CKE1 and CKE0. For further details on selection of the SCI clock source,
see table 13.9 in section 13.3, Operation.
Bit 1:
CKE1
0
0
1
1
Notes: 1. The SCK pin is multiplexed with other functions. Set the pin function controller (PFC) to
13.2.7
The serial status register (SSR) is an 8-bit register containing multiprocessor bit values, and status
flags that indicate the SCI operating status.
The CPU can always read and write to SSR, but cannot write 1 in the status flags (TDRE, RDRF,
ORER, PER, and FER). These flags can be cleared to 0 only if they have first been read (after
being set to 1). Bits 2 (TEND) and 1 (MPB) are read-only bits that cannot be written. SSR is
initialized to H'84 by a reset and in standby mode.
Note: * Only 0 can be written, to clear the flag.
Bit
Initial value
Read/Write
2. Initial value
3. The output clock frequency is the same as the bit rate.
4. The input clock frequency is 16 times the bit rate.
Bit 0:
CKE0
0
1
0
1
Serial Status Register
select the SCK function and SCK input/output for the SCK pin.
Description *
Asynchronous mode
Synchronous mode
Asynchronous mode
Synchronous mode
Asynchronous mode
Synchronous mode
Asynchronous mode
Synchronous mode
R/(W)*
TDRE
7
1
1
R/(W)*
RDRF
6
0
R/(W)*
ORER
Internal clock, SCK pin used for input pin (input signal
is ignored) or output pin (output level is undefined) *
Internal clock, SCK pin used for serial clock output *
Internal clock, SCK pin used for clock output *
Internal clock, SCK pin used for serial clock output
External clock, SCK pin used for clock input *
External clock, SCK pin used for serial clock input
External clock, SCK pin used for clock input *
External clock, SCK pin used for serial clock input
5
0
Section 13 Serial Communication Interface (SCI)
R/(W)*
FER
4
0
Rev. 7.00 Jan 31, 2006 page 363 of 658
R/(W)*
PER
3
0
TEND
R
2
1
REJ09B0272-0700
MPB
R
1
0
(Initial value)
(Initial value)
4
4
3
MPBT
R/W
0
0
2
2