M306N5FCTFP Renesas Electronics America, M306N5FCTFP Datasheet - Page 111

• Manufacturer Part Number: M306N5FCTFP
• Description: IC M16C MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/6Nr

Specifications of M306N5FCTFP

• Core Processor: M16C/60
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, I²C, IEBus, SIO, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 87
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 26x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

M16C/6N Group (M16C/6N5)
Rev.2.40
REJ09B0011-0240
Figure 11.2 Registers WDC and WDTS
11.1 Count Source Protective Mode
In this mode, a on-chip oscillator clock is used for the watchdog timer count source. The watchdog timer can
be kept being clocked even when CPU clock stops as a result of runaway.
Before this mode can be used, the following register settings are required:
(1) Set the PRC1 bit in the PRCR register to 1 (write to registers PM1 and PM2 enabled).
(2) Set the PM12 bit in the PM1 register to 1 (reset when the watchdog timer underflows).
(3) Set the PM22 bit in the PM2 register to 1 (on-chip oscillator clock used for the watchdog timer count source).
(4) Set the PRC1 bit in the PRCR register to 0 (write to registers PM1 and PM2 disabled).
(5) Write to the WDTS register (watchdog timer starts counting).
Setting the PM22 bit to 1 results in the following conditions:
• The on-chip oscillator starts oscillating, and the on-chip oscillator clock becomes the watchdog timer
• The CM10 bit in the CM1 register is disabled against write. (Writing a 1 has no effect, nor is stop mode entered.)
• The watchdog timer does not stop when in wait mode or hold state.
count source.
Watchdog timer period =
Watchdog Timer Control Register
NOTE
Watchdog Timer Start Register
b7
b7
1. Write to the WDTS register after the watchdog timer interrupt request is generated.
Apr 14, 2006
b6
0 0
b5
b4
b3
b2
page 89 of 372
b1
b0
b0
The watchdog timer is initialized and starts counting after a write instruction to
this register. The watchdog timer value is always initialized to 7FFFh regardless
of whatever value is written.
Bit Symbol
Watchdog timer count (32768)
WDC7
(b4-b0)
(b6-b5)
On-chip oscillator clock
Symbol
Symbol
-
-
WDTS
WDC
(1)
High-order bits of watchdog timer
Reserved bits
Prescaler select bit
Address
Bit Name
000Fh
Address
000Eh
Function
00XXXXXXb
Set to 0
0 : Divide-by-16
1 : Divide-by-128
After Reset
After Reset
Undefined
Function
11. Watchdog Timer
RW
RW
RW
RO
RW
WO