m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 87

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

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Table 7.7 Microcomputer Status in a Hold State
Table 7.8 External Bus State when Accessing Internal Space
Table 7.9 RAS, CASL, CASH and DW Signals
2
________
0
Oscillation
RD Signal, WR Signal, Address Bus, Data Bus, BHE,
_______
CS0 to CS3
Programmable I/O Ports: P0 to P15
__________
HLDA
Internal Peripheral Circuits
ALE Signal
Address bus
Data Bus
RD, WR, WRL, WRH
BHE
_______
CS0 to CS3
ALE
_____
_____
Data Bus Width
7.2.8 External Bus State when Accessing Internal Space
7.2.9 BCLK Output
7.2.10 DRAM Control Signals (RAS, CASL, CASH and DW)
C
1
9
3 .
B
8 /
Table 7.8 shows external bus states when an internal space is accessed.
The CPU clock operates the CPU. When combining the PM07 bit in the PM0 register set to "0" (BCLK
output) and the CM01 to CM00 bits in the CM0 register set to "00
P5
No BCLK is output in single-chip mode. Refer to 8. Clock Generating Circuit for details.
The DRAM control signals control the DRAM. The DRAM control signals are output when the DRAM
area, determined by the AR0 to AR2 bits in the DRAMCONT register, is output. Table 7.9 lists each
signal operation.
0
1
3
16 bits
______
0
8 bits
3
3
J
G
4
as BCLK.
a
_______
_______
o r
0 -
n
3 .
________ _________
1
u
_______
, 1
3
p
Item
_____
1
(
2
M
When Read
When Write
0
0
3
__________
6
2
C
RAS
8 /
L
L
L
L
L
L
L
L
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__________
M
3
Item
2
C
f o
Holds an address of an external space accessed just before
High-impedance
High-impedance
Output "H"
Holds state of external space last accessed
Output "H"
Output ALE
CASL
8 /
H
4
L
L
H
L
L
L
L
3
8
) T
8
_____
State when accessing SFR, internal ROM and internal RAM
Not used
Not used
_______
CASH
H
H
L
L
L
L
__________
_______
DW
H
H
H
H
L
L
L
L
__________
On
High-impedance
Maintains the same state as when HOLD signal
is received
Output "L"
On (excluding the watchdog timer)
Output "L"
Read 1-byte data
Write 1-byte data
Read data from both even and odd addresses
Read 1-byte data from even address
Read 1-byte data from odd address
Write data to both even and odd addresses
Write 1-byte data to even address
Write 1-byte data to odd address
2
", the CPU clock signal is output from
_____
Data Bus State
Status
__________
7. Bus