M30620FCAFP#U5 Renesas Electronics America, M30620FCAFP#U5 Datasheet - Page 68
M30620FCAFP#U5
Manufacturer Part Number
M30620FCAFP#U5
Description
IC M16C MCU FLASH 100QFP
Manufacturer
Renesas Electronics America
Series
M16C™ M16C/60r
Datasheets
1.M30622SAFPU5.pdf
(277 pages)
2.M30622SAFPU5.pdf
(617 pages)
3.M30622SAFPU5.pdf
(308 pages)
Specifications of M30620FCAFP#U5
Core Processor
M16C/60
Core Size
16-Bit
Speed
16MHz
Connectivity
SIO, UART/USART
Peripherals
DMA, PWM, WDT
Number Of I /o
85
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
10K x 8
Voltage - Supply (vcc/vdd)
4.2 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
Package
100PQFP
Family Name
M16C
Maximum Speed
16 MHz
Operating Supply Voltage
5 V
Data Bus Width
16|32 Bit
Number Of Programmable I/os
87
Interface Type
SIM/UART
On-chip Adc
10-chx10-bit
On-chip Dac
2-chx8-bit
Number Of Timers
11
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
M30620FCAFP#U5M30620FCAFP#D3
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Watchdog Timer
Watchdog Timer
With X
Watchdog timer period =
With X
Watchdog timer period =
Figure 1.12.1. Block diagram of watchdog timer
The watchdog timer has the function of detecting when the program is out of control. Therefore, we recom-
mend using the watchdog timer to improve reliability of a system.The watchdog timer is a 15-bit counter
which down-counts the clock derived by dividing the BCLK using the prescaler. A watchdog timer interrupt
is generated when an underflow occurs in the watchdog timer. When X
the watchdog timer control register (address 000F
When X
timer control register (address 000F
below. The watchdog timer's period is, however, subject to an error due to the prescaler.
For example, suppose that BCLK runs at 16 MHz and that 16 has been chosen for the dividing ratio of the
prescaler, then the watchdog timer's period becomes approximately 32.8 ms.
The watchdog timer is initialized by writing to the watchdog timer start register (address 000E
a watchdog timer interrupt request is generated. The prescaler is initialized only when the microcomputer is
reset. After a reset is cancelled, the watchdog timer and prescaler are both stopped. The count is started by
writing to the watchdog timer start register (address 000E
watchdog timer and prescaler are stopped. Counting is resumed from the held value when the modes or
state are released.
Figure 1.12.1 shows the block diagram of the watchdog timer. Figure 1.12.2 shows the watchdog timer-
related registers.
Write to the watchdog timer
start register
(address 000E
IN
CIN
RESET
CIN
chosen for BCLK
HOLD
BCLK
chosen for BCLK
is selected as the BCLK, the prescaler is set for division by 2 regardless of bit 7 of the watchdog
16
)
prescaler dividing ratio (16 or 128) X watchdog timer count (32768)
prescaler dividing ratio (2) X watchdog timer count (32768)
Prescaler
16
1/128
1/16
1/2
). Thus the watchdog timer's period can be calculated as given
“CM07 = 0”
“WDC7 = 1”
“CM07 = 0”
“WDC7 = 0”
“CM07 = 1”
16
) selects the prescaler division ratio (by 16 or by 128).
BCLK
16
). In stop mode, wait mode and hold state, the
BCLK
Watchdog timer
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
IN
Set to
“7FFF
is selected for the BCLK bit 7 of
16
”
M16C / 62A Group
Mitsubishi microcomputers
Watchdog timer
interrupt request
16
) and when
65
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