h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 310

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h8s-2111b

Manufacturer Part Number
h8s-2111b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
12.8.7
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 12.25.
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, CKE1 = 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
Rev. 1.00, 05/04, page 276 of 544
Figure 12.26 Prevention of Low Pulse Output at Switching from SCK Pins to Port Pins
Switching from SCK Pins to Port Pins
SCK/Port
Data
TE
C/A
CKE1
CKE0
SCK/Port
Data
TE
C/A
CKE1
CKE0
Figure 12.25 Switching from SCK Pins to Port Pins
Bit 6
Bit 6
Bit 7
Bit 7
1. Transmission end
1. Transmission end
2. TE = 0
2. TE = 0
3. CKE1 = 1
3. C/A = 0
4. Low pulse output
Low pulse of half a cycle
4. C/A = 0
High output
5. CKE1 = 0

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