UPD78F0500MC-5A4-A Renesas Electronics America, UPD78F0500MC-5A4-A Datasheet - Page 237

• Manufacturer Part Number: UPD78F0500MC-5A4-A
• Description: MCU 8BIT FLASH SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0500MC-5A4-A

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2
(6) Main clock mode register (MCM)
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
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
the setting of XSEL and MCM0.
• Watchdog timer (operates with internal low-speed oscillation clock)
• When “f
• Peripheral hardware selects the external clock as the clock source
Figure 6-9. Format of Main Clock Mode Register (MCM)
Operates with internal high-speed oscillation clock
Operates with high-speed system clock
(operates with internal low-speed oscillation clock)
(Except when the external count clock of TM0n (n = 0, 1) is selected (TI00n pin
valid edge))
MCM0
6
0
0
1
0
1
RL
R/W
Internal high-speed oscillation clock
(f
High-speed system clock (f
”, “f
RH
Selection of clock supplied to main system clock and peripheral hardware
)
Note
5
0
RL
Main system clock (f
/2
PRS
7
”, or “f
is supplied to the following peripheral functions regardless of
4
0
RL
Main system clock status
/2
9
” is selected as the count clock for 8-bit timer H1
XH
XP
)
)
3
0
CHAPTER 6 CLOCK GENERATOR
Internal high-speed oscillation clock
(f
High-speed system clock (f
RH
XSEL
Peripheral hardware clock (f
)
<2>
MCS
<1>
XH
)
MCM0
<0>
PRS
)
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