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16
NON-BREAK DEBUG (NBD)
16-11
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
EVTU_A, EVTU_C
information
Address bus,
R/W signal information
Output "L" when
a match is detected
NBDEVNT# pin
Also output "L"
by writing any data
NEVNTGEN
Register
Comparate
circuit
Output "L" for 2BCLK
Figure 16.6.1 NBDEVNT# Pin Configuration
16.6 Event Detection Function
The NBD has the function to output an event occurrence when there is a matching address accessed for read/write in the
CPU space. The event output is active "L," and is asserted synchronously with BCLK for a period of 2 BCLK cycles.
The NBDEVNT# pin also can output "L" level signal for 2 BCLK cycles when the NEVNTGEN register located in
the CPU space is accessed for write. Output from the NBDEVNT# pin is generated by matching the above-
mentioned address or a write access to the NEVNTGEN register
Figure 16.6.1 shows the structure of the NBDEVNT# pin.
16.6.1 Event Address Setting Register
Event Address Setting Register (EVTU_A)
<Address: H'800–H'803 (NBD space)>
b0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
b15
EVTU_A
????????????????
b16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
b31
EVTU_A
??????????????
0
<Upon exiting reset: Undefined>
b
Bit Name
Function
R
W
0–29
EVTU_A
Specify the target address A0–A29 for event detection
R
W
30, 31
No function assigned. Fix to "0."
00
Notes: In the NBDEN bit of NBD enable register (NBDENB), AVTU_A bit value becomes indefinite after setting from "0" (disable
NBD operation) to "1"(enable NBD operation).
After enabling NBD operation(after setting "1"in NBDEN bit of NBDENB register), an indefinite value is outputted from
NBDEVENT# pin in NBD pin control register(NBDCNT) during the period of time from setting NBD-related pins to NBD
function to setting value of EVTU_A and EVTU_C are effective(period of time from Ready status to after 3NBDCLK).
During event detection function is used, when the setting value of EVTU_A register or EVTU_C register is changed, the
event detection result by the changed setting conditions becomes effective after 3NBDCLK from setting EVTU_A
register or EVTU_C register (at the time of being Ready state in flag sense period).
16.6 Event Detection Function