m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 179

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.9.17 Setting of related registers (1) [Counting without clock errors during a power failure]
CPUM
CPUM
T1
T12M
T34M
IREQ1
IREQ2
CPU mode register (Address:3B
CPU mode register (Address:3B
Timer 1 (Address:20
Timer 12 mode register (Address:28
Timer 34 mode register (Address:29
Interrupt request register 1 (Address:3C
Interrupt request register 2 (Address:3D
0
0
0
0
0
0
0
0
0
1
0
63
3819 Group USER’S MANUAL
1
0 0 0
0 0
16
0 0
)
0
0
16
16
Timer 3 output selection : I/O port
Timer 3 count : Operating
Timer 3 count source : Timer 2 underflow
2.9 Clock generating circuit
X
Main clock f(X
Internal system clock : f(X
Set “division ratio – 1”
Set “00
Set the Timer 1 interrupt request bit to “0”
Set the Timer 3 interrupt request bit to “0”
)
)
CIN
16
16
–X
)
)
COUT
16
16
16
”
)
)
: Oscillating
IN
) : High-speed mode
MITSUBISHI MICROCOMPUTER
IN
)/2 (high-speed mode)
3819 Group
165