st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 83

• Manufacturer Part Number: st10f269z1
• Description: St10f269 16-bit Mcu With Mac Unit, 256k Byte Flash Memory And 12k Byte Ram
• Manufacturer: STMicroelectronics

ST10F269
ODP6 (F1CEH / E7H)
12.9.1 - Alternate Functions of Port 6
A programmable number of chip select signals (CS4...CS0) derived from the bus control registers
(BUSCON4...BUSCON0) can be output on 5 pins of Port 6.
The number of chip select signals is selected via PORT0 during reset. The selected value can be read
from bit-field CSSEL in register RP0H (read only) in order to check the configuration during run time.
The Table 23 summarizes the alternate functions of Port 6 depending on the number of selected chip
select lines (coded via bit-field CSSEL).
Table 23 : Port 6 Alternate Functions
Figure 36 : Port 6 I/O and Alternate Functions
DP6.y
ODP6.y
15
-
Port 6
P6.0
P6.1
P6.2
P6.3
P6.4
P6.5
P6.6
P6.7
14
-
13
-
HOLD External hold request input
HLDA Hold acknowledge output
BREQ Bus request output
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
Alternate Function
12
Port Direction Register DP6 Bit y
DP6.y = 0: Port line P6.y is an input (high impedance)
DP6.y = 1: Port line P6.y is an output
Port 6 Open Drain Control Register Bit y
ODP6.y = 0: Port line P6.y output driver in push-pull mode
ODP6.y = 1: Port line P6.y output driver in open drain mode
-
CSSEL = 10
General Purpose Input/Output
11
Port 6
-
Alternate Function
10
-
9
-
P6.7
P6.6
P6.5
P6.4
P6.3
P6.2
P6.1
P6.0
8
General purpose I/O
General purpose I/O
General purpose I/O
-
Alternate Function
Chip select CS0
Chip select CS1
CSSEL = 01
ODP6.7 ODP6.6 ODP6.5 ODP6.4 ODP6.3 ODP6.2 ODP6.1 ODP6.0
RW
7
ESFR
RW
6
RW
5
General purpose I/O
General purpose I/O
Alternate Function
Chip select CS0
Chip select CS1
Chip select CS2
CSSEL = 00
RW
4
a)
BREQ
HLDA
HOLD
CS4
CS3
CS2
CS1
CS0
RW
12 - PARALLEL PORTS
3
RW
2
Alternate Function
Chip select CS0
Chip select CS1
Chip select CS2
Chip select CS3
Chip select CS4
Reset Value: --00h
CSSEL = 11
RW
1
83/184
RW
0