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| 型号： | P83C266 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for PAL/SECAM TV with OSD and VST(带 OSD和 VST的在PAL/SECAM TV中应用的微控制器) |
| 中文描述： | 对于PAL微控制器/ OSD和伟仕SECAM电视（带OSD和伟仕的在PAL制式/ SECAM电视中应用的微控制器） |
| 文件页数： | 71/92页 |
| 文件大小： | 382K |
| 代理商： | P83C266 |
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1999 Mar 10
71
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
18.2
EPROM Programming mode
In the EPROM programming mode the selected EPROM is
under the direct control of the external pins. For entering
the programming mode the RESET pin serves as the data
input and the XTALIN pin serves as the clock input. There
is no need to synchronise the addresses, data, read and
write signals with the CPU.
To enter the programming mode, the microcontroller must
first be reset in accordance to the normal reset procedure
to avoid the Idle mode. The programming code is then
shifted in serially via the RESET pin and stored in a
register. After decoding, the required control signals are
generated.
18.2.1
S
ERIAL PROGRAMMING CODES
Once the device has been reset the programming code
can be shifted in via the RESET pin. The 10-bit
programming code is shown in Fig.45 and defined in
Table 85.
Table 85
Programming code format
BIT
FUNCTION
9 to 6
Stop bits.
These are the last 4 bits to be
shifted in and always take the value ‘0101’,
indicating the end of the test mode code.
Mode bits.
These 5 bits follow the start bit
and select the test mode; see Table 86.
Start bit.
This is the first bit to be shifted in
and is always a logic 0, indicating that the
following 5 bits are test mode code.
5 to 1
0
Fig.45 Serial programming code.
handbook, halfpage
MGM683
0
X X X X X
0
1
0
bit 9
1
Stop bits
Mode bits
Start bit
Table 86
Test mode selection.
18.2.2
E
NTERING THE
P
ROGRAMMING MODE
The procedure for entering the Programming mode is
detailed below and illustrated in Fig.47
1.
The normal reset should be active for at least
24 XTALIN clocks:
a) The first 10 XTALIN clocks cancel any special
modes
b) The 24 XTALIN clocks (2 machine cycles) ensure
that the CPU core is reset.
2.
Shift in the programming code via the RESET pin
3.
Wait at least 2 XTALIN clocks until the control signals
are ready, then the EPROM address, data and control
signals can be applied. The RESET pin should be
released within 10 XTALIN clocks to prevent the circuit
escaping from EPROM programming mode.
18.2.3
L
EAVING THE
P
ROGRAMMING MODE
The device will exit the Programming mode when the
RESET pin is driven HIGH for at least 10 XTALIN clock
cycles.
18.3
Programming and verification
It is not recommended to carry out programming/verify
operations on a byte basis. It is far better to program all
program EPROM (or OSD EPROM) and then verify the
contents.
18.4
OSD EPROM bit map and the sequence of
programming OSDL and OSDH
Each character bit pattern is stored in the on-chip
ROM/EPROM. The character displayed on the screen is in
a 12
×
18 dot matrix format, however it is stored in the
on-chip character ROM in a 12
×
19 format. For the OSD
EPROM character the dot matrix is 16
×
19, but only
12
×
19 is used, therefore the high nibble of OSDH must
be filled with FH.
MODE BITS
TEST MODE
5
4
3
2
1
0
0
0
0
1
1
0
1
0
0
Program EPROM
OSD EPROM
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