UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 64

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

relationship between the CPU clock (f
(2) Low-speed internal oscillation mode register (LSRCM)
64
The fastest instruction of the PD78F9500, 78F9501, 78F9502 is executed in two CPU clocks. Therefore, the
Address: FF58H, After reset: 00H, R/W
Symbol
LSRCM
This register is used to select the operation mode of the low-speed internal oscillator (240 kHz (TYP.)).
This register is valid when it is specified by the option byte that the low-speed internal oscillator can be stopped
by software. If it is specified by the option byte that the low-speed internal oscillator cannot be stopped by
software, setting of this register is invalid, and the low-speed internal oscillator continues oscillating. In addition,
the source clock of WDT is fixed to the low-speed internal oscillator.
WATCHDOG TIMER.
LSRCM can be set by using a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets LSRCM to 00H.
Note The CPU clock (high-speed internal oscillation clock, or external clock input) is selected by the option
f
f
f
f
f
X
X
X
X
X
/2
/2
/2
/2
2
3
4
CPU Clock (f
byte.
Table 5-2. Relationship between CPU Clock and Minimum Instruction Execution Time
LSRSTOP
Figure 5-4. Format of Low-Speed internal oscillation Mode Register (LSRCM)
7
0
0
1
CPU
)
Note
Low-speed internal oscillates
Low-speed internal oscillator stops
6
0
0.25 s
0.5 s
1.0 s
2.0 s
4.0 s
High-speed internal oscillation clock
CPU
CHAPTER 5 CLOCK GENERATORS
) and the minimum instruction execution time is as shown in Table 5-2.
Preliminary User’s Manual U18681EJ1V0UD
(at 8.0 MHz (TYP.))
5
0
Oscillation/stop of low-speed internal oscillator
Minimum Instruction Execution Time: 2/f
4
0
3
0
0.2 s
0.4 s
0.8 s
1.6 s
3.2 s
2
0
External clock input
For details, refer to CHAPTER 7
(at 10.0 MHz)
CPU
1
0
LSRSTOP
<0>