HD404019R Datasheet, PDF (28/65 Pages) Renesas Technology Corp – CMOS 4-bit single-chip microcomputers

HD404019R Series
TMB2
0
1
TMB1
0
1
0
1
TMB0
0
1
0
1
0
1
0
1
Prescaler Divide Ratio, Clock Input Source
÷ 2048
÷ 512
÷ 128
÷ 32
÷8
÷4
÷2
INT₁ (external event input)
PMR: $004
PMR3 PMR2 PMR1 PMR0
SMR: $005
SMR3 SMR2 SMR1 SMR0
Transmit clock selection
R4₀/SCK pin mode selection
R4₂/SO pin mode selection
R4₁/SI pin mode selection
R3₂/INT₀ pin mode selection
R3₃/INT₁ pin mode selection
TMA: $008
TMA2 TMA1 TMA0
TMB: $009
TMB3 TMB2 TMB1 TMB0
Timer B input clock selection
Auto-reload function selection
Timer A input clock selection
Figure 14 Mode Register Configuration and Function
Timer B (TCBL: $00A, TCBU: $00B, TLRL: $00A, TLRU: $00B): Timer B consists of an 8-bit write-
only timer load register, and an 8-bit read-only timer counter. Each of them has a low-order digit (TCBL:
$00A, TLRL: $00A) and a high-order digit (TCBU: $00B, TLRU: $00B). (Refer to figure 2.)
Timer counter B can be initialized by writing data into timer load register B. Write the low-order digit first,
and then the high-order digit. The timer counter is initialized when the high-order digit is written. The timer
load register is initialized to $00 by the MCU reset.
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