18 UART
222
EPSON
S1C17001 TECHNICAL MANUAL
IrDA receive detection clock selection
The input pulse detection clock is selected from among the prescaler output clock PCLK-1/1 to PCLK-1/128
using IRCLK[2:0] (D[6:4]/UART_EXP register)
∗
IRCLK[2:0]
: IrDA Receive Detection Clock Select Bits in the UART Expansion (UART_EXP) Register
(D[6:4]/0x4105)
Table 18.8.1: IrDA receive detection clock selection
IRCLK[2:0]
Prescaler output clock
0x7
PCLK-1/128
0x6
PCLK-1/64
0x5
PCLK-1/32
0x4
PCLK-1/16
0x3
PCLK-1/8
0x2
PCLK-1/4
0x1
PCLK-1/2
0x0
PCLK-1/1
(Default: 0x0)
This clock must be selected as a clock faster than the 8-bit timer or transfer clock sclk input via the SCLK pin.
The demodulation circuit treats Low pulses with a width of at least 2 IrDA receive detection clock cycles as
valid and converts them to 16 sclk cycle width Low pulses. Select the prescaler output clock to enable detection
of input pulses with a minimum width of 1.41
μ
s.
Serial data transfer control
Data transfer control in IrDA mode is identical to that for normal interfaces. For detailed information on data
format settings and data transfer and interrupt control methods, refer to the previous discussions.
Содержание S1C17001
Страница 1: ...Technical Manual S1C17001 CMOS 16 BIT SINGLE CHIP MICROCONTROLLER ...
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