m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 81

• 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
3
. v
J
2
Figure 7.3 WCR Register
0
7.2.4 Bus Timing
C
1
9
3 .
B
8 /
Bus cycle for the internal ROM and internal RAM are basically one BCLK cycle. When the PM12 bit in the
PM1 register is set to "1" (wait state), the bus cycles are two BCLK cycles.
Bus cycles for the SFR are basically two BCLK cycles. When the PM13 bit in the PM1 register is set to "1"
(2 wait states), the bus cycles are three BCLK cycles. To access CAN-associated registers (addresses
01E0
Bus cycle for an external space is basically one BCLK cycle for a read operation and two BCLK cycles for
a write operation. The WCR register inserts wait states equivalent to one to three BCLK cycles into an
external space. Bus cycles are two BCLK cycles if selecting one wait state. Bus cycles are four BCLK
cycles if selecting three wait states.
If applicable to the followings, bus cycles vary from those selected by the WCR register. Figure 7.5
shows each bit status and bus cycle.
Figure 7.3 shows the WCR register. Figures 7.4 and 7.5 show bus timing in an external space.
0
1
3
0
• Write cycle with the separate bus and no wait state
• Read cycle and write cycle with the multiplexed bus and no wait state.
• Read cycle and write cycle with the multiplexed bus and one wait state.
3
J
G
4
a
16
o r
Wait Control Register
0 -
n
b7
3 .
1
u
to 0245
, 1
3
p
b6
NOTES:
1
(
2
M
b5
1. When using the multiplexed bus, "2 waits" is selected even if the WCR register is set to "00
2. When using the separate bus, the read bus runs one BCLK cycle and the write bus runs two
0
3.The WCR register cannot be used in M32C/83T.
0
3
wait state) or "01
BCLK cycles (1 wait state) if the WCR register is set to "00
6
2
b4
16
C
8 /
), set the PM13 bit to "1".
b3
Page 58
, 3
b2
M
b1
3
2
C
b0
f o
2
8 /
" (1 wait state). "10
4
3
Symbol
8
WCR0
WCR1
WCR2
WCR3
WCR4
WCR5
WCR6
WCR7
) T
8
Bit
(1, 2, 3)
Symbol
WCR
External Space 0
Wait Bit
External Space 1
Wait Bit
External Space 2
Wait Bit
External Space 3
Wait Bit
Bit Name
2
" (2 wait states) and "11
Address
0008
16
b1 b0
b3 b2
b5 b4
b7 b6
0 0: No wait state
0 1: 1 wait state
1 0: 2 wait states
1 1: 3 wait states
0 0: No wait state
0 1: 1 wait state
1 0: 2 wait states
1 1: 3 wait states
0 0: No wait state
0 1: 1 wait state
1 0: 2 wait states
1 1: 3 wait states
0 0: No wait state
0 1: 1 wait state
1 0: 2 wait states
1 1: 3 wait states
2
".
2
" (3 wait states) can be selected.
After Reset
1111 1111
Function
2
2
" (no
RW
RW
RW
RW
RW
RW
RW
RW
RW
7. Bus