UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 466

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) 5-bit counter
(2) Frequency divider
(3) Both-edge detection circuit
16.4.2 Baud Rate Generator Control Register (BRGC, BRGC2)
clock in 3-wire serial I/O mode.
in Figure 16-15.
426
The BRGC and BRGC2 are 8-bit registers that set the baud rate clock in asynchronous serial interface mode or the shift
These registers can be written to only with an 8-bit manipulation instruction. The BRGC and BRGC2 format is shown
RESET input clears the BRGC register to 00H.
Caution When a baud rate generator control register (BRGC, BRGC2) write instruction is executed, the 5-bit
Counter that counts the clock (f
with the frequency selected by the low-order 4 bits of the baud rate generator control registers (BRGC/BRGC2).
Scales the internal clock (f
input (ASCK/ASCK2), and selects fPRS with the next-stage selector.
Detects both edges of the ASCK/ASCK2 pin input signal and generates a signal with a frequency twice that of the ASCK/
ASCK2 input clock.
counter and 1/2 frequency divider operations are reset. Consequently, if a write to the BRGC and
BRGC2 is performed during communication, the generated baud rate clock may be disrupted,
preventing normal communication from continuing. The BRGC and BRGC2 should therefore not be
written to during communication.
CHAPTER 16 ASYNCHRONOUS SERIAL INTERFACE/3-WIRE SERIAL I/O
XX
/2) or, in asynchronous serial interface mode, a clock that is twice the external baud rate
PRS
) by which the output from the frequency divider is selected. Generates a signal