UPD78F0551MA-FAA-AX Renesas Electronics America, UPD78F0551MA-FAA-AX Datasheet - Page 250

• Manufacturer Part Number: UPD78F0551MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0551MA-FAA-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 9
• 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-L
5.6.7 Condition before changing CPU clock and processing after changing CPU clock
R01UH0028EJ0400 Rev.4.00
Sep 27, 2010
KY2-L,
KA2-L,
KB2-L,
KC2-L
KC2-L
Condition before changing the CPU clock and processing after changing the CPU clock are shown below.
Remark Only 78K0/KC2-L is provided with a subsystem clock.
Before Change
Internal high-
speed
oscillation
clock
X1 clock
External main
system clock
Internal high-
speed
oscillation
clock
X1 clock
External main
system clock
Internal high-
speed
oscillation
clock
X1 clock
External main
system clock
XT1 clock,
external
subsystem
clock
CPU Clock
X1 clock
External main
system clock
Internal high-
speed
oscillation
clock
XT1 clock
External
subsystem
clock
Internal high-
speed
oscillation
clock
X1 clock
External main
system clock
After Change
Stabilization of X1 oscillation
• MSTOP = 0, OSCSEL = 1, EXCLK = 0
• After elapse of oscillation stabilization
Enabling input of external clock from
EXCLK pin
• MSTOP = 0, OSCSEL = 1, EXCLK = 1
Oscillation of internal high-speed oscillator
• RSTOP = 0
Stabilization of XT1 oscillation
• XTSTART = 0, EXCLKS = 0,
• After elapse of oscillation stabilization
Enabling input of external clock from
EXCLKS pin
• XTSTART = 0, EXCLKS = 1,
Oscillation of internal high-speed oscillator
and selection of internal high-speed
oscillation clock as main system clock
• RSTOP = 0, MCS = 0
Stabilization of X1 oscillation and
selection of high-speed system clock as
main system clock
• MSTOP = 0, OSCSEL = 1, EXCLK = 0
• After elapse of oscillation stabilization
• MCS = 1
Enabling input of external clock from
EXCLK pin and selection of high-speed
system clock as main system clock
• MSTOP = 0, OSCSEL = 1, EXCLK = 1
• MCS = 1
OSCSELS = 1
OSCSELS = 1, or XTSTART = 1
time
time
time
Table 5-7. Changing CPU Clock
Condition Before Change
Internal high-speed oscillator can be
stopped (RSTOP = 1).
Internal high-speed oscillator can be
stopped (RSTOP = 1).
X1 oscillation can be stopped (MSTOP = 1).
External main system clock input can be
disabled (MSTOP = 1).
Operating current can be reduced by
stopping internal high-speed oscillator
(RSTOP = 1).
X1 oscillation can be stopped (MSTOP = 1).
External main system clock input can be
disabled (MSTOP = 1).
Operating current can be reduced by
stopping internal high-speed oscillator
(RSTOP = 1).
X1 oscillation can be stopped (MSTOP = 1).
External main system clock input can be
disabled (MSTOP = 1).
XT1 oscillation can be stopped or external
subsystem clock input can be disabled
(OSCSELS = 0).
XT1 oscillation can be stopped or external
subsystem clock input can be disabled
(OSCSELS = 0).
XT1 oscillation can be stopped or external
subsystem clock input can be disabled
(OSCSELS = 0).
CHAPTER 5 CLOCK GENERATOR
Processing After Change
236