PSD4256G6V Datasheet, PDF (42/100 Pages) STMicroelectronics – Flash In-System Programmable (ISP) Peripherals for 16-bit MCUs

PSD4256G6V
Output Macrocell (OMC)
Eight of the Output Macrocells (OMC) are con-
nected to Ports A pins and are named as McellA0-
McellA7. The other eight Macrocells are connect-
ed to Ports B pins and are named as McellB0-
McellB7.
The Output Macrocell (OMC) architecture is
shown in Figure 15, page 44. As shown in the fig-
ure, there are native product terms available from
the AND Array, and borrowed product terms avail-
able (if unused) from other Output Macrocells
(OMC). The polarity of the product term is con-
trolled by the XOR gate. The Output Macrocell
(OMC) can implement either sequential logic, us-
ing the flip-flop element, or combinatorial logic.
The multiplexer selects between the sequential or
combinatorial logic outputs. The multiplexer output
can drive a port pin and has a feedback path to the
AND Array inputs.
The flip-flop in the Output Macrocell (OMC) block
can be configured as a D, T, JK, or SR type in the
PSDsoft program. The flip-flop’s clock, preset, and
clear inputs may be driven from a product term of
the AND Array. Alternatively, the external CLKIN
(PD1) signal can be used for the clock input to the
flip-flop. The flip-flop is clocked on the rising edge
of CLKIN (PD1). The preset and clear are active
High inputs. Each clear input can use up to two
product terms.
Table 33. Output Macrocell Port and Data Bit Assignments
Output
Macrocell
Port
Assignment
Native Product
Terms
Maximum
Borrowed
Product Terms
McellA0
Port A0
3
6
McellA1
Port A1
3
6
McellA2
Port A2
3
6
McellA3
Port A3
3
6
McellA4
Port A4
3
6
McellA5
Port A5
3
6
McellA6
Port A6
3
6
McellA7
Port A7
3
6
McellB0
Port B0
4
5
McellB1
Port B1
4
5
McellB2
Port B2
4
5
McellB3
Port B3
4
5
McellB4
Port B4
4
6
McellB5
Port B5
4
6
McellB6
Port B6
4
6
McellB7
Port B7
4
6
Note: 1. D7-D0 are used for loading or reading in 8-bit mode.
16-bit MCU
Loading or
Reading⁽¹⁾
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
Motorola 16-bit
MCU for
Loading or
Reading
D8
D9
D10
D11
D12
D13
D14
D15
D0
D1
D2
D3
D4
D5
D6
D7
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This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.