UPD78F0500AMC-CAB-AX Renesas Electronics America, UPD78F0500AMC-CAB-AX Datasheet - Page 251

• Manufacturer Part Number: UPD78F0500AMC-CAB-AX
• Description: MCU 8BIT 30SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0500AMC-CAB-AX

• 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
6.6.2 Example of controlling internal high-speed oscillation clock
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
The following describes examples of clock setting procedures for the following cases.
(1) When restarting oscillation of the internal high-speed oscillation clock
(2) When using internal high-speed oscillation clock as CPU clock, and internal high-speed oscillation clock or high-
(3) When stopping the internal high-speed oscillation clock
(b) To stop X1 oscillation (disabling external clock input) by setting MSTOP to 1
speed system clock as peripheral hardware clock
<1> Confirming the CPU clock status (PCC and MCM registers)
• 78K0/KB2
• 78K0/KC2, 78K0/KD2, 78K0/KE2, and 78K0/KF2
<2> Stopping the high-speed system clock (MOC register)
Caution Be sure to confirm that MCS = 0 or CLS = 1 when setting MSTOP to 1. In addition, stop
MCS
CLS
0
1
0
0
1
Confirm with CLS and MCS that the CPU is operating on a clock other than the high-speed system clock.
When CLS = 0 and MCS = 1, the high-speed system clock is supplied to the CPU, so change the CPU
clock to a clock other than the high-speed system clock.
When MSTOP is set to 1, X1 oscillation is stopped (the input of the external clock is disabled).
peripheral hardware that is operating on the high-speed system clock.
Internal high-speed oscillation clock
High-speed system clock
MCS
0
1
×
Internal high-speed oscillation clock
High-speed system clock
Subsystem clock
CPU Clock Status
CPU Clock Status
CHAPTER 6 CLOCK GENERATOR
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