m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 86

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

R
R
M
e
E
. v
J
3
Figure 7.7 RD Signal Output Extended by RDY Signal
Figure 7.8 Order of Bus Priority
0
2
7.2.7 HOLD Signal
1
9
C
3 .
B
The HOLD signal transfers bus privileges from the CPU to external circuits. When an "L" signal is applied
to the HOLD pin , the microcomputer enters a hold state after bus access is completed. While the HOLD
pin is held "L", the microcomputer is in a hold state and the HLDA pin outputs an "L" signal. Table 7.7
shows the microcomputer status in a hold state.
Bus is used in the following order of priority: HOLD, DMAC, CPU.
8 /
0
1
0
3
3
J
__________
G
4
a
0 -
n
_________
__________
o r
3 .
1
u
, 1
3
(2) Multiplexed Bus with 2 Wait States
(1) Separate Bus with 2 Wait States
_____
p
1
2
NOTES:
(
0
M
BCLK
RD
CS
(i=0 to 3)
RDY
BCLK
RD
CS
(i=0 to 3)
RDY
1. The chip-select signal (CSi) may be extended depending on CPU state such as the instruction
0
3
6
tsu
Timing to receive RDY for j wait(s): j+1 cycles (j = 1 to 3)
i
i
queue buffer.
2
(1)
(1)
C
(RDY-BCLK)
8 /
: Wait states inserted by RDY
: Wait states inserted by program
Page 63
, 3
M
3
1st cycle
1st cycle
: Setup time for RDY input
2
C
f o
8 /
4
8
3
8
) T
__________
HOLD > DMAC > CPU
2nd cycle
2nd cycle
________
__________
Timing to receive RDY
Timing to receive RDY
3rd cycle
3rd cycle
tsu(RDY - BCLK)
tsu(RDY - BCLK)
_________
4th cycle
4th cycle
__________
7. Bus