HD64F36912GFH Renesas Electronics America, HD64F36912GFH Datasheet - Page 241

• Manufacturer Part Number: HD64F36912GFH
• Description: IC H8 MCU FLASH 8K 32-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H Tinyr

Specifications of HD64F36912GFH

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 12MHz
• Connectivity: I²C, SCI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

14.3.9
SPMR controls the serial communication function.
Bit
7 to 3
2
1, 0
RXD input signal
Sampling clock
Noise Filter Circuit
The RXD input signal is latched through the noise filter circuit. The noise filter circuit
comprises a series of three latch circuits and a match detection circuit. The RXD input signal is
sampled by the basic clock with the 16 times the transfer clock frequency. If three latch
outputs match, its level is transferred to the next stage. If not, the circuit holds the previous
value.
That is, when the incoming signal holds the same level for three clock cycles, it is regarded as
the proper signal. If the levels of the signal is less than three clock cycles, the signal is
regarded as a noise.
Bit Name
STDSPM
Sampling Mode Register (SPMR)
Internal basic clock cycle
Sampling clock
D
Figure 14.2 Block Diagram of Noise Filter Circuit
Initial
Value
All 1
1
All 1
Latch
C
Q
R/W
R/W
D
Latch
C
Q
Description
Reserved
These bits are always read as 1.
Noise Filter Function Select
Selects the noise filter function for the RXD pin in
asynchronous mode.
0: Noise filter circuit is enabled
1: Noise filter circuit is disabled
Reserved
These bits are always read as 1.
D
Latch
C
Section 14 Serial Communication Interface 3 (SCI3)
Q
Match
detection
circuit
Rev. 3.00 Sep. 14, 2006 Page 211 of 408
(STDSPM)
SPMR
REJ09B0105-0300
Internal RXD
signal shown
in figure 14.1