HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 431

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

15.9.8
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 15.28.
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/$ = 1, CKE1 = 0, CKE1 = 0, and TE = 1.
1. End serial data transmission
2. TE bit = 0
3. CKE1 bit = 1
4. C/$ bit = 0 (switch to port output)
5. CKE1 bit = 0
Figure 15.29 Prevention of Low Pulse Output at Switching from SCK Pins to Port Pins
SCK/Port
Data
TE
C/
CKE1
CKE0
SCK/Port
Data
TE
C/
CKE1
CKE0
Notes on Switching from SCK Pins to Port Pins
Bit 6
Bit 6
Figure 15.28 Switching from SCK Pins to Port Pins
Bit 7
Bit 7
1. Transmission end
1. Transmission end
2. TE = 0
2. TE = 0
3. CKE1 = 1
3. C/ = 0
4. Low pulse output
Low pulse of half a cycle
4. C/ = 0
Rev. 2.0, 08/02, page 391 of 788
High output
5. CKE1 = 0