HD404344R Datasheet, PDF (48/102 Pages) Renesas Technology Corp – 4-bit microcomputer has an A/D converter

HD404344R Series/HD404394 Series
R Port
The R port consists of input/output pins each addressed by 4 bits. Input/output is controlled by the LAR and
LBR instructions and the LRA and LRB instructions. The output data is stored in the port data register
(PDR) of each pin. The on/off status of the output buffers is controlled by the R-port data control registers
(DCR0–DCR3: $030–$033), which are mapped to memory addresses (figure 19).
The R1₀–R1₂ ports of the HD404394 series are n-channel middle-voltage open drain input/output pins.
The R0₀–R0₃ pins are also used as peripheral function pins: SCK, SI, SO, and TOC. Setting of the
peripheral functions for these pins is executed by bit 3 (SMR3) of the serial mode register (SMR:$005) and
by bits 2 to 0 (PMRA2–PMRA0) of port mode register A (PMRA: $004), as shown in figures 21 and 22.
The R3₀–R3₃ pins of the HD404344R series and HD4074344 are also used as AN₀–AN₃ peripheral function
pins. Pins R3₁–R3₃ of the HD404394 series are also used as AN₁–AN₃ peripheral function pins. The setting
of peripheral functions for these pins is executed by bits 3 to 0 (AMR13–AMR10) of A/D mode register 1
(AMR1: $019). For the HD404394 series, the use of AMR10 is prohibited (figure 23).
Port mode register A (PMRA: $004)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
—
0
0
0
—
W
W
W
Not used PMRA2 PMRA1 PMRA0
PMRA2
0
1
R0₃/TOC Mode Selection
R0₃
TOC
PMRA0
0
1
R0₂/SO Mode Selection
R0₂
SO
PMRA1
0
1
R0₁/SI Mode Selection
R0₁
SI
Figure 21 Port Mode Register A (PMRA)
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