UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 211

• Manufacturer Part Number: UPD78F0550MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0550MA-FAA-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 10MHz
• Number Of I /o: 12
• Core Processor: 78K/0
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Program Memory Size: 4KB (4K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: LVD, POR, PWM, WDT
• Connectivity: I²C, LIN, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

the internal high-speed oscillation clock and the high-speed system clock).
pre-switchover clock for several clocks (refer to Table 5-10).
ascertained using bit 1 (MCS) of MCM.
Remark 2. When switching the CPU clock from the main system clock to the subsystem clock, calculate the
By setting bit 0 (MCM0) of the main clock mode register (MCM), the main system clock can be switched (between
The actual switchover operation is not performed immediately after rewriting to MCM0; operation continues on the
Whether the CPU is operating on the internal high-speed oscillation clock or the high-speed system clock can be
Cautions 1.
Remarks 1. The number of clocks listed in Table 5-10 is the number of main system clocks before switchover.
2.
2. Calculate the number of clocks in Table 5-10 by removing the decimal portion.
Set Value Before Switchover
number of clocks by rounding up to the next clock and discarding the decimal portion, as shown
below.
Example When switching CPU clock from f
Example When switching the main system clock from the internal high-speed oscillation clock to the
When switching the internal high-speed oscillation clock to the high-speed system clock, bit
2 (XSEL) of MCM must be set to 1 in advance. The value of XSEL can be changed only once
after a reset release.
Do not rewrite MCM0 when the CPU clock operates with the subsystem clock.
Table 5-10. Maximum Time Required for Main System Clock Switchover
MCM0
32.768 kHz)
0
1
high-speed system clock (@ oscillation with f
f
1 + 2f
XP
/f
SUB
IH
/f
= 10000/32.768
XH
= 1 + 2
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 5 CLOCK GENERATOR
1 + 2f
XH
8/10 = 1 + 2
/f
IH
clock
305.1
0
Set Value After Switchover
XP
0.8 = 1 + 1.6 = 2.6
306 clocks
to f
SUB
MCM0
IH
= 8 MHz, f
(@ oscillation with f
1 + 2f
IH
/f
XH
XH
clock
= 10 MHz)
2 clocks
1
XP
= 10 MHz, f
SUB
211
=