M3087BFLBGP#U5 Renesas Electronics America, M3087BFLBGP#U5 Datasheet - Page 337

• Manufacturer Part Number: M3087BFLBGP#U5
• Description: IC M32C/87 MCU FLASH 144LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M32C/80r

Specifications of M3087BFLBGP#U5

• Core Processor: M32C/80
• Core Size: 16/32-Bit
• Speed: 32MHz
• Connectivity: EBI/EMI, I²C, IEBus, IrDA, SIO, UART/USART
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 121
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 34x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: R0K330879S001BE - KIT DEV RSK M32C/87R0K330879S000BE - KIT DEV RSK M32C/87
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

M32C/87 Group (M32C/87, M32C/87A, M32C/87B)
REJ09B0180-0151 Rev.1.51 Jul 31, 2008
Page 313 of 587
19. D/A Converter
The D/A converter consists of two independent 8-bit R-2R ladder D/A converter circuits.
Digital code is converted to analog voltage every time a value to be converted is written to the corresponding DAi
register (i = 0, 1), if bits DATi1 and DATi0 in the DACON1 register are set to 00b. Every time the selected timer
underflows, a value in the DAi register is transferred to the DAi buffer and the D/A conversion is performed, if bits
DATi1 and DATi0 are set to 01b, 10b, or 11b. The values in the DAi buffer is 00h after reset.
The DAiE bit in the DACON register determines whether the D/A conversion result is output or not. When the DAiE
bit is set to 1 (output enabled), the corresponding port cannot be pulled up.
When the D/A converter is not used, set registers DAi and DACON1 to 00h and the DAiE bit to 0 (output disabled).
Output analog voltage (
register.
Table 19.1 lists specifications of the D/A converter. Figure 19.1 shows a block diagram of the D/A converter. Table
19.2 lists pin settings of DA0 and DA1. Figure 19.2 shows registers associated with the D/A converter. Figure 19.3
shows a D/A converter equivalent circuit.
Figure 19.1
Table 19.1
Table 19.2
NOTES:
D/A conversion method
Resolution
Analog output pin
P9_3
P9_4
1. Set the PS3 register after setting the other registers.
2. Set the PD9 or PS3 register immediately after the PRC2 bit in the PRCR register is set to 1 (write enable). Do
Port
i = 0, 1
DAiE: bit in the DACON register
DAi1, DAi0: bits in the DACON1 register
NOTE:
VREF: Reference voltage (VREF remains connected even if the VCUT bit in the AD0CON1 register is set to 0)
not generate an interrupt or a DMA or DMACII transfer between these two instructions.
1. When bits DATi1 and DATi0 are set to 01b, 10b or 11b, a value in the DAi register is transferred to the DAi buffer every time the
V =
selected timer underflows. The value in the DAi buffer is 00h after reset.
DA0 output
DA1 output
Item
D/A Converter Specifications
D/A Converter Block Diagram
Pin Settings
VREF x n
Function
256
Read
V
) is obtained from the following equation using the value n (n = decimal) set in the DAi
(n = 0 to 255)
PD9_3=0
PD9_4=0
DAi1 to DAi0
PD9 Register
Low-order bits of data bus
R-2R
8 bits
2 channels
R-2R Resistor Ladder
DAi register
00
(2)
DAi buffer
01
10
11
PSL3_3=1
PSL3_4=1
PSL3 Register
(1)
Bit Setting
DAiE
Specification
DAi1 to DAi0
DAi
PS3_3=0
PS3_4=0
PS3 Register
00
01
10
11
TA3 underflow
TA4 underflow
TB0 underflow
(1)(2)
19. D/A Converter