UPD78F1000GB-GAF-AX Renesas Electronics America, UPD78F1000GB-GAF-AX Datasheet - Page 384

• Manufacturer Part Number: UPD78F1000GB-GAF-AX
• Description: MCU 16BIT 78K0R/KX3-L 44-LQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Kx3-Lr

Specifications of UPD78F1000GB-GAF-AX

• Core Processor: 78K/0R
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0R/Kx3-L
7.6.7 Condition before changing CPU clock and processing after changing CPU clock
Note
R01UH0106EJ0300 Rev.3.00
Oct 01, 2010
Internal high-
speed oscillation
clock
X1 clock
External main
system clock
Before Change
Condition before changing the CPU clock and processing after changing the CPU clock are shown below.
The 78K0R/KC3-L (40-pin) doesn’t have the subsystem clock.
CPU Clock
X1 clock
External main
system clock
Subsystem clock
Note
20 MHz internal
high-speed
oscillation clock
Internal high-
speed oscillation
clock
External main
system clock
Subsystem clock
Note
20 MHz internal
high-speed
oscillation clock
Internal high-
speed oscillation
clock
X1 clock
Subsystem clock
Note
20 MHz internal
high-speed
oscillation clock
After Change
Stabilization of X1 oscillation
• OSCSEL = 1, EXCLK = 0, MSTOP = 0
• After elapse of oscillation stabilization time
Enabling input of external clock from the
EXCLK pin
• OSCSEL = 1, EXCLK = 1, MSTOP = 0
Stabilization of XT1 oscillation
• OSCSELS = 1, XTSTOP = 0
• After elapse of oscillation stabilization time
Stabilization of DSC oscillation with 20 MHz
set by using the option byte
• V
• After elapse of oscillation stabilization
• SELDSC = 1
Oscillation of internal high-speed oscillator
• HIOSTOP = 0
Transition not possible
(To change the clock, set it again after
Stabilization of XT1 oscillation
• OSCSELS = 1, XTSTOP = 0
• After elapse of oscillation stabilization time
Transition cannot be performed unless the
clock is changed to the internal high-speed
oscillation clock once.
Oscillation of internal high-speed oscillator
• HIOSTOP = 0
Transition not possible
(To change the clock, set it again after
executing reset once.)
Stabilization of XT1 oscillation
• OSCSELS = 1, XTSTOP = 0
• After elapse of oscillation stabilization time
Transition cannot be performed unless the
clock is changed to the internal high-speed
oscillation clock once.
executing reset once.)
time (100
DD
≥ 2.7 V
Table 7-5. Changing CPU Clock (1/2)
Condition Before Change
μ
s) after setting to DSCON = 1
Operating current can be reduced by
stopping internal high-speed oscillator
(HIOSTOP = 1).
X1 oscillation can be stopped (MSTOP = 1).
X1 oscillation can be stopped (MSTOP = 1).
External main system clock input can be
disabled (MSTOP = 1).
External main system clock input can be
disabled (MSTOP = 1).
CHAPTER 7 CLOCK GENERATOR
Processing After Change
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