UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 521

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

18.2 CLOCK OUTPUT MODE REGISTER (CLOM)
The CLOM controls the clock output function.
CLOM can be read or written to with an 8-bit manipulation instruction or bit manipulation instruction.
The CLOM format is shown in Figure 18-2.
RESET input clears the CLOM register to 00H.
Cautions 1. With the PD784021, and when the external memory extension mode is used, the clock output
CLOM
2. The other bits (FS0 to FS2 and LV) must not be changed while the CLE bit is set (1).
3. The other bits (FS0 to FS2 and LV) must not be changed at the same time when the CLE bit is
LV
7
mode register (CLOM) should be set to 00H (value after RESET release).
changed.
6
0
5
0
Figure 18-2 Clock Output Mode Register (CLOM) Format
CLE
4
CHAPTER 18 CLOCK OUTPUT FUNCTION
3
0
FS2
2
FS1
1
FS0
0
* Outputs the system clock
Duty
0FFC6H
Address
CLE
FS2
LV
0
0
0
0
1
0
1
0
1
50 %
Clock Output Control
Output Level Control
Outputs LV bit contents
Outputs clock selected by bits FS2 to FS0
Outputs low level
Outputs high level
FS1
0
0
1
1
0
On Reset
00H
FS0
0
1
0
1
0
R/W
R/W
Frequency Selection
f
f
f
f
f
CLK
CLK
CLK
CLK
CLK
*
/2
/4
/8
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