UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 63

• 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

5.3
The clock generators are controlled by the following three registers.
(1) Processor clock control register (PCC) and preprocessor clock control register (PPCC)
Address: FFFBH, After reset: 02H, R/W
Symbol
PCC
Address: FFF3H, After reset: 02H, R/W
Symbol
PPCC
Processor clock control register (PCC)
Preprocessor clock control register (PPCC)
Low-speed internal oscillation mode register (LSRCM)
Registers Controlling Clock Generators
These registers are used to specify the division ratio of the system clock.
PCC and PPCC are set by using a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets PCC and PPCC to 02H.
Notes 1.
PPCC1
7
0
7
0
0
0
0
1
0
1
Figure 5-3. Format of Preprocessor Clock Control Register (PPCC)
2. If PPCC = 01H, the clock (f
3. If PPCC = 02H, the clock (f
Figure 5-2. Format of Processor Clock Control Register (PCC)
Other than above
The setting range of the CPU clock differs depending on the supply voltage to be used.
Be sure to refer to CPU clock and peripheral clock frequencies described in AC
Characteristics in CHAPTER 16 ELECTRICAL SPECIFICATIONS (TARGET).
PPCC0
6
0
6
0
0
1
0
0
1
0
CHAPTER 5 CLOCK GENERATORS
Preliminary User’s Manual U18681EJ1V0UD
PCC1
5
0
5
0
0
0
1
0
1
1
f
f
f
f
f
f
Setting prohibited
X
X
X
X
X
X
/2
/2
/2
/2
/2
XP
XP
2
2 Note 3
3 Note 2
4 Note 3
Note 2
) supplied to the peripheral hardware is f
) supplied to the peripheral hardware is f
4
0
4
0
Selection of CPU clock (f
3
0
3
0
2
0
2
0
CPU
PPCC1
PCC1
)
1
1
Note 1
X
X
/2.
/2
2
.
PPCC0
0
0
0
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