15.10.8 Notes On Switching From Sck Pins To Port Pins; Figure 15.40 Switching From Sck Pins To Port Pins - Renesas H8S Series Hardware Manual

15.10.8 Notes on Switching from SCK Pins to Port Pins

When SCK pins are switched to port pins after transmission has completed, pins are enabled for
port output after outputting a low pulse of half a cycle as shown in figure 15.40.
SCK/Port
Bit 6
Data
TE
C/A
CKE1
CKE0
To prevent the low pulse output that is generated when switching the SCK pins to the port pins,
specify the SCK pins for input (pull up the SCK/port pins externally), and follow the procedure
below with DDR = 1, DR = 1, C/A = 1, CKE1 = 0, CKE0 = 0, and TE = 1.
1. End serial data transmission
2. TE bit = 0
3. CKE1 bit = 1
4. C/A bit = 0 (switch to port output)
5. CKE1 bit = 0
1. Transmission end
Bit 7
2. TE = 0

Figure 15.40 Switching from SCK Pins to Port Pins

Section 15 Serial Communication Interface (SCI, IrDA)
Low pulse of half a cycle
4. Low pulse output
3. C/A = 0
Rev. 3.00 Jul. 14, 2005 Page 503 of 986
REJ09B0098-0300