UPD70F3738GF-GAS-AX Renesas Electronics America, UPD70F3738GF-GAS-AX Datasheet - Page 221

• Manufacturer Part Number: UPD70F3738GF-GAS-AX
• Description: MCU 32BIT V850ES/JX3-L 100-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Lr

Specifications of UPD70F3738GF-GAS-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 84
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(b) Example of changing subclock operation to main clock operation
<1> MCK bit ← 0:
<2> Insert waits by program and wait until the oscillation stabilization time of the main clock has elapsed.
<3> CK3 bit ← 0:
<4> Main clock operation:
Caution Enable operation of the on-chip peripheral functions operating on the main clock only
[Description example]
<1> _START_MAIN_OSC :
<2> movea
<3> st.b
<4> nop
_DMA_DISABLE:
clrl
st.b
clr1
_WAIT_OST :
nop
nop
nop
addi
bnz
clr1
_DMA_ENABLE:
setl
after the oscillation of the main clock stabilizes. If their operations are enabled before
the lapse of the oscillation stabilization time, a malfunction may occur.
0, DCHCn[r0]
r0, PRCMD[r0]
6, PCC[r0]
0x55, r0, r11
-1, r11, r11
_WAIT_OST
r0, PRCMD[r0]
3, PCC[r0]
0, DCHCn[r0]
CHAPTER 6 CLOCK GENERATOR
Use of a bit manipulation instruction is recommended. Do not change the
Main clock starts oscillating
CK2 to CK0 bits.
It takes the following time after the CK3 bit is set until main clock operation
is started.
Therefore, insert one NOP instruction immediately after setting the CK3 bit
to 0.
Max.: 1/f
User’s Manual U18953EJ5V0UD
XT
(1/subclock frequency)
-- DMA operation disabled. n = 0 to 3
-- Release of protection of special registers
-- Main clock starts oscillating.
-- Wait for oscillation stabilization time.
-- CK3 ← 0
-- DMA operation enabled. n = 0 to 3
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