UPD78F1233GB-GAH-AX Renesas Electronics America, UPD78F1233GB-GAH-AX Datasheet - Page 264

• Manufacturer Part Number: UPD78F1233GB-GAH-AX
• Description: MCU 16BIT 78K0R/LX3 64-LQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Ix3r

Specifications of UPD78F1233GB-GAH-AX

• Core Processor: 78K/0R
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

5.6.6 Condition before changing CPU clock and processing after changing CPU clock
Note
262
Before Change
Internal high-
speed
oscillation
clock
X1 clock
External main
system clock
Condition before changing the CPU clock and processing after changing the CPU clock are shown below.
The 78K0R/IB3 doesn’t have the subsystem clock.
CPU Clock
X1 clock
External main
system clock
Subsystem
clock
40 MHz internal
high-speed
oscillation clock
Internal high-
speed oscillation
clock
External main
system clock
Subsystem
clock
40 MHz internal
high-speed
oscillation clock
Internal high-
speed oscillation
clock
X1 clock
Subsystem
clock
40 MHz internal
high-speed
oscillation clock
After Change
Note
Note
Note
Stabilization of X1 oscillation
• OSCSEL = 1, EXCLK = 0, MSTOP = 0
• After elapse of oscillation stabilization time
Enabling input of external clock from
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
• After elapse of oscillation stabilization
• DSPO = 1, 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
Table 5-6. Changing CPU Clock (1/2)
CHAPTER 5 CLOCK GENERATOR
Condition Before Change
User’s Manual U19678EJ1V1UD
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).
Processing After Change
−
−
−
−
−