HD64336900G Datasheet, PDF (285/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

16.2 Input/Output Pins
Table 16.1 summarizes the input pins used by the A/D converter.
Table 16.1 Pin Configuration
Pin Name
Analog power supply pin
Analog input pin 0
Analog input pin 1
Analog input pin 2
Analog input pin 3
A/D external trigger input pin
Symbol
AVCC
AN0
AN1
AN2
AN3
ADTRG
I/O
Input
Input
Input
Input
Input
Input
Function
Analog block power supply pin
Analog input pins
External trigger input pin for starting A/D
conversion
16.3 Register Description
The A/D converter has the following registers.
• A/D data register A (ADDRA)
• A/D data register B (ADDRB)
• A/D data register C (ADDRC)
• A/D data register D (ADDRD)
• A/D control/status register (ADCSR)
• A/D control register (ADCR)
16.3.1 A/D Data Registers A to D (ADDRA to ADDRD)
There are four 16-bit read-only ADDR registers; ADDRA to ADDRD, used to store the results of
A/D conversion. The ADDR registers, which store a conversion result for each channel, are shown
in table 16.2.
The converted 10-bit data is stored in bits 6 to 15. The lower 6 bits are always read as 0.
The data bus between the CPU and the A/D converter is 8 bits wide. The upper byte can be read
directly from the CPU, however the lower byte should be read via a temporary register. The
temporary register contents are transferred from the ADDR when the upper byte data is read.
When reading ADDR, read the upper bytes only or read in word units. ADDR is initialized to
H'0000.
Rev. 1.00, 11/03, page 257 of 376