UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 182

• 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: -

(6) Main clock mode register (MCM)
182
This register selects the main system clock supplied to CPU clock and clock supplied to peripheral hardware
clock.
MCM can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Address: FFA1H
Symbol
MCM
Note Bit 1 is read-only.
Cautions 1. XSEL can be changed only once after a reset release.
XSEL
MCS
7
0
0
0
1
1
0
1
After reset: 00H
2. Do not rewrite MCM0 when the CPU clock operates with the subsystem clock.
3. A clock other than f
Figure 5-9. Format of Main Clock Mode Register (MCM)
Operates with internal high-speed oscillation clock
Operates with high-speed system clock
regardless of the setting of XSEL and MCM0.
MCM0
Watchdog timer (operates with internal low-speed oscillation clock)
When “f
(operates with internal low-speed oscillation clock)
Peripheral hardware selects the external clock as the clock source
(Except when the external count clock of TM00 is selected (TI000 pin valid
edge))
6
0
0
1
0
1
R/W
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 5 CLOCK GENERATOR
Internal high-speed oscillation clock
(f
High-speed system clock (f
IL
IH
”, “f
Selection of clock supplied to main system clock and peripheral hardware
)
Note
5
0
IL
Main system clock (f
/2
6
”, or “f
PRS
4
0
IL
Main system clock status
/2
is supplied to the following peripheral functions
15
” is selected as the count clock for 8-bit timer H1
XH
XP
)
)
3
0
Internal high-speed oscillation clock
(f
High-speed system clock (f
IH
)
XSEL
Peripheral hardware clock (f
<2>
MCS
<1>
XH
)
MCM0
<0>
PRS
)