upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 131
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upd78f0124hgba1-8et-a
Manufacturer Part Number
upd78f0124hgba1-8et-a
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0124HGBA1-8ET-A.pdf
(502 pages)
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(4) Prescaler mode register 00 (PRM00)
Notes 1.
This register is used to set the 16-bit timer counter 00 (TM00) count clock and the valid edges of the TI000 and
TI010 pin input.
PRM00 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears PRM00 to 00H.
Address: FFBBH
Symbol
PRM00
2.
Be sure to set the count clock so that the following condition is satisfied.
The external clock requires a pulse two cycles longer than the internal clock (f
• V
• V
• V
• V
PRM001
DD
DD
DD
DD
ES101
ES101
ES001
= 4.0 to 5.5 V: Count clock ≤ 10 MHz
= 3.3 to 4.0 V: Count clock ≤ 8.38 MHz
= 2.7 to 3.3 V: Count clock ≤ 5 MHz
= 2.5 to 2.7 V: Count clock ≤ 2.5 MHz (standard products, (A) grade products only)
7
0
0
1
1
0
0
1
1
0
0
1
1
After reset: 00H
Figure 6-8. Format of Prescaler Mode Register 00 (PRM00)
PRM000
ES100
ES000
ES100
6
0
1
0
1
0
1
0
1
0
1
0
1
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
R/W
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
f
f
f
TI000 pin valid edge
X
X
X
/2
/2
(10 MHz)
ES001
2
8
(2.5 MHz)
(39.06 kHz)
User’s Manual U16962EJ3V0UD
5
ES000
4
Note 2
TI010 pin valid edge selection
TI000 pin valid edge selection
Count clock selection
3
0
2
0
Note 1
PRM001
X
).
1
PRM000
0
131
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