M30800SFP-BL#U5 Renesas Electronics America, M30800SFP-BL#U5 Datasheet - Page 68

• Manufacturer Part Number: M30800SFP-BL#U5
• Description: MCU 3/5V 0K,PB-FREE 100-QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/80r

Specifications of M30800SFP-BL#U5

• Core Processor: M16C/80
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 45
• Program Memory Type: ROMless
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

M
R
R
8.8 Protection
e
E
1
v
J
Figure 8.8 Protect register
6
1 .
0
The protection function is provided so that the values in important registers cannot be changed in the event
that the program runs out of control. Figure 8.8 shows the protect register. The values in the processor
mode register 0 (address 0004
ister 0 (address 0006
(address 000C
03B5
tant outputs can be allocated to port P9.
If, after “1” (write-enabled) has been written to the PRC2 (bit 2 at address 000A
address, the bit automatically reverts to “0” (write-inhibited). Change port P9 input/output and function
select register A3 immediately after setting "1" to PRC2. Interrupt and DMA transfer should not be inserted
between instructions. However, the PRC0 (bit 0 at address 000A
not automatically return to “0” after a value has been written to an address. The program must therefore be
written to return these bits to “0”.
C
9
0 .
8 /
B
0
0
0
1
A
16
G
8
Protect register
b7 b6 b5 b4 b3 b2 b1 b0
u
7
o r
) can only be changed when the respective bit in the protect register is set to “1”. Therefore, impor-
. g
0 -
u
1
0
p
0
, 2
0
2
0
16
0
5
), port P9 direction register (address 03C7
Page 55
16
), system clock control register 1 (address 0007
Note: Writing a value to an address after “1” is written to this bit returns the bit
Bit symbol
Nothing is assigned.
When write, set "0". When read, their contents are indeterminate.
f o
PRC0
PRC1
16
PRC2
Symbol
PRCR
3
), processor mode register 1 (address 0005
to “0”. Other bits do not automatically return to “0” and they must therefore
be reset by the program.
2
9
Enables writing to processor mode
registers 0 and 1 (addresses 0004
and 0005
Enables writing to system clock
control registers 0 and 1 (addresses
0006
division register (address 000C
Enables writing to port P9 direction
register (address 03C7
function select register A3 (address
03B5
16
16
) (Note
and 0007
16
)
Address
Bit name
000A
)
16
)
16
and main clock
16
) and
XXXXX000
When reset
16
) and function select register A3 (address
16
16
)
16
) and PRC1 (bit 1 at address 000A
0 : Write-inhibited
1 : Write-enabled
0 : Write-inhibited
1 : Write-enabled
0 : Write-inhibited
1 : Write-enabled
2
16
8. Clock Generating Circuit
), main clock division register
16
Function
16
), system clock control reg-
), a value is written to any
R
W
16
) do