US38024-BAG1 Renesas Electronics America, US38024-BAG1 Datasheet - Page 406

• Manufacturer Part Number: US38024-BAG1
• Description: DEV EVALUATION KIT H8/38024
• Manufacturer: Renesas Electronics America
• Series: H8®r
• Type: MCUr

Specifications of US38024-BAG1

• Contents: 2G (Second-generation) Evaluation Board, HEW debugger support, Cable and CD-ROM
• For Use With/related Products: H8/38024
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 10 Serial Communication Interface
8. Transmit and receive operations when making a state transition
Make sure that transmit and receive operations have completely finished before carrying out state
transition processing.
9. Switching SCK
If pin SCK
general input/output pin (a pin with a different function), the pin outputs a low level signal for half
a system clock (φ) cycle immediately after it is switched.
This can be prevented by either of the following methods according to the situation.
a. When an SCK
b. When an SCK
10. Set up at subactive or subsleep mode
At subactive or subsleep mode, SCI3 becomes possible use only at CPU clock is φw/2.
11. Oscillator use with serial communications interface (H8/38124 Group only)
When implementing the serial communications interface on the H8/38124 Group, the system
clock oscillator must be used. The on-chip oscillator should not be used in this case. See on-chip
oscillator selection method in section 4.2, System Clock Generator, for information on switching
between the system clock oscillator and the on-chip oscillator.
Rev. 8.00 Mar. 09, 2010 Page 384 of 658
REJ09B0042-0800
When stopping data transfer, issue one instruction to clear bits TE and RE to 0 and to set bits
CKE1 and CKE0 in SCR3 to 1 and 0, respectively. In this case, bit COM in SMR should be
left 1. The above prevents SCK
intermediate level of voltage from being applied to SCK
be pulled up to the V
When stopping data transfer,
(i) Issue one instruction to clear bits TE and RE to 0 and to set bits CKE1 and CKE0 in SCR3
(ii) Clear bit COM in SMR to 0
(iii) Clear bits CKE1 and CKE0 in SCR3 to 0
Note that special care is also needed here to avoid an intermediate level of voltage from being
applied to SCK
to 1 and 0, respectively.
32
is used as a clock output pin by SCI3 in synchronous mode and is then switched to a
32
32
32
32
function is switched from clock output to non clock-output
function is switched from clock output to general input/output
.
function
CC
level via a resistor, or supplied with output from an external device.
32
from being used as a general input/output pin. To avoid an
32
, the line connected to SCK
32
should