HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 130

MCU 5V 32K PB-FREE 100-TQFP

HD6477021X20V

Manufacturer Part Number
HD6477021X20V
Description
MCU 5V 32K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7020r
Datasheet

Specifications of HD6477021X20V

Core Processor
SH-1
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (32K x 8)
Program Memory Type
OTP
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
HD6477021X20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Bit 5: CKS2
0
1
• Bits 2–0 (reserved): These bits always read as 0. The write value should always be 0.
8.2.8
The refresh timer counter (RTCNT) is a 16-bit read/write register that is used as an 8-bit upcounter
that generates the refresh or interrupt request. When the input clock is selected by clock select bits
2–0 (CKS2–CKS0) in RTCSR, that clock makes the RTCNT start incrementing. When the values
of RTCNT and the refresh time constant register (RTCOR) match, RTCNT is cleared to H'0000
and the CMF flag of the RTCSR is set to 1. When the RFSHE bit of the RCR is also set to 1, a
CAS-before-RAS refresh is performed. When the CMIE bit of the RTCSR is also set to 1, a
compare match interrupt (CMI) is generated.
Bits 15–8 are reserved bits and do not count. These bits always read as 0.
RTCNT is initialized to H'0000 by a power-on reset, but is not initialized by a manual reset or by
the standby mode.
To prevent RTCSR from being written incorrectly, it must be written by a different method from
most other registers. A word transfer operation is used, H'69 is written in the top byte and the
actual data is written in the lower byte. For details, see section 8.2.11, Register Access.
110 RENESAS
Refresh Timer Counter (RTCNT)
Bit 4: CKS1
0
1
0
1
Bit 3: CKS0
0
1
0
1
0
1
0
1
Description
Clock input disabled (initial value)
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