M30878FJGP#U3 Renesas Electronics America, M30878FJGP#U3 Datasheet - Page 173
![IC M32C/87 MCU FLASH 144LQFP](/photos/12/30/123084/m30878fjgp_u3_sml.jpg)
M30878FJGP#U3
Manufacturer Part Number
M30878FJGP#U3
Description
IC M32C/87 MCU FLASH 144LQFP
Manufacturer
Renesas Electronics America
Series
M16C™ M32C/80r
Datasheet
1.M3087BFLGPU3.pdf
(629 pages)
Specifications of M30878FJGP#U3
Core Processor
M32C/80
Core Size
16/32-Bit
Speed
32MHz
Connectivity
CAN, EBI/EMI, I²C, IEBus, IrDA, SIO, UART/USART
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
121
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Ram Size
31K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 34x10b, D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
144-LQFP
For Use With
R0K330879S001BE - KIT DEV RSK M32C/87
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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M32C/87 Group (M32C/87, M32C/87A, M32C/87B)
REJ09B0180-0151 Rev.1.51 Jul 31, 2008
Page 149 of 587
13.2
13.3
Table 13.3
Table 13.4
i=0 to 3, p=0 and 1
8-bit transfer
(BWi bit in the DMDp
register = 0)
16-bit transfer
(BWi bit = 1)
The DMA transfer time can be calculated as follows. (in terms of bus clock)
Table 13.3 lists the number of the source read cycle and destination write cycle. Table 13.4 lists coefficient j, k (the
number of bus clock).
Transfer time = source read bus cycle × j + destination write bus cycle × k
When multiple DMA requests are generated in the same sampling period (between a falling edge of the BCLK and
the next falling edge), the corresponding DRQ bits in the DMiSL register (i = 0 to 3) are set to 1 (requested)
simultaneously. Channel priority in this case is: DMA0 > DMA1 > DMA2 > DMA3. Leave the following period
between each DMA transfer request generation on the same channel.
DMA request interval ≥ (number of channels set for DMA transfer - 1) × 5 BCLK cycles
Described in the following is the operation when DMA0 and DMA1 requests are generated in the same sampling
period. Figure 13.9 shows an example of DMA transfers triggered by the INT interrupts.
In Figure 13.9, DMA0 and DMA1 requests are generated simultaneously. A DMA0 request having higher priority
is acknowledged first to start a transfer. After one DMA0 transfer is completed, the DMAC returns ownership of
the bus to the CPU. When the CPU has completed one bus access, a DMA1 transfer starts. After one DMA1
transfer is completed, bus ownership is again returned to the CPU.
DMA requests cannot be counted up since each channel has one DRQ bit. Even if multiple DMA1 requests are
generated before receiving bus ownership as shown in Figure 13.9, the DRQ bit is set to 0 as soon as bus ownership
is acquired. Bus ownership is returned to the CPU after one transfer is completed.
with no wait state
Internal ROM or
internal RAM
Transfer Unit
DMA Transfer Time
Channel Priority and DMA Transfer Timing
k=1
j=1
Source Read Cycle and Destination Write Cycle
Coefficient j, k
Internal Space
16 bits
8 bits
16 bits
8 bits
Internal ROM or
with wait state
Bus Width
internal RAM
k=2
j=2
Even
Odd
Even
Odd
Even
Odd
Even
Odd
Address
Access
SFR area
k=2
j=2
Read Cycle
Accessing Internal Space
j and k BCLK cycles shown in Table 8.6 (j, k = 2 to 9).
Add one cycle to j or k cycles when inserting a recovery
cycle
1
1
−
−
1
2
−
−
Write Cycle
1
1
1
−
−
2
−
−
External Space
Read Cycle
Accessing External Space
1
1
1
1
1
2
2
2
Write Cycle
13. DMAC
1
1
1
1
1
2
2
2
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