M3087BFKBGP#U3 Renesas Electronics America, M3087BFKBGP#U3 Datasheet - Page 128
M3087BFKBGP#U3
Manufacturer Part Number
M3087BFKBGP#U3
Description
IC M32C/87B MCU FLASH 144LQFP
Manufacturer
Renesas Electronics America
Series
M16C™ M32C/80r
Datasheet
1.M3087BFLGPU3.pdf
(629 pages)
Specifications of M3087BFKBGP#U3
Core Processor
M32C/80
Core Size
16/32-Bit
Speed
32MHz
Connectivity
EBI/EMI, I²C, IEBus, IrDA, SIO, UART/USART
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
121
Program Memory Size
768KB (768K x 8)
Program Memory Type
FLASH
Ram Size
48K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 34x10b, D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
144-LQFP
For Use With
R0K330879S001BE - KIT DEV RSK M32C/87R0K330879S000BE - KIT DEV RSK M32C/87
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
M3087BFKBGP#U3M3087BFKBGP#U5
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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M32C/87 Group (M32C/87, M32C/87A, M32C/87B)
REJ09B0180-0151 Rev.1.51 Jul 31, 2008
Page 104 of 587
9.6
Figure 9.16
The system clock protect function prohibits the clock setting from being rewritten in order to prevent the CPU
clock source from being changed when a program goes out of control.
When the PM21 bit in the PM2 register is set to 1 (disables a clock change), the following bits cannot be written:
The CPU clock continues running when the WAIT instruction is executed.
Figure 9.16 shows a procedure to use the system clock protect function. Follow the procedure while the CM05 bit
in the CM0 register is set to 0 (main clock oscillates) and the CM07 bit to 0 (main clock as CPU clock source).
NOTE:
•
•
•
•
Bits CM02, CM05, and CM07 in the CM0 register
Bits CM10 and CM17 in the CM1 register
The CM20 bit in the CM2 register
All bits in registers PLC0 and PLC1
1. When entering wait mode, execute the WAIT instruction while the PM21 bit in the PM2 register is set to 0.
System Clock Protect Function
PRCR register: PRC1 bit = 1
PM2 register: PM21 bit = 1
PRCR register: PRC1 bit = 0
Procedure to Use System Clock Protect Function
Start
End
(Note 1)
Enable writing to registers associated with clocks
Disable a clock change
Disable writing to registers associated with clocks
9. Clock Generation Circuits
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